The answer to that question separates agencies running real programs from ones coasting on Advantage+ automation and a monthly PDF with four screenshots.
Here's what a paid social agency should be doing, broken down by function. Then we'll get into what most of them are actually doing instead. If you want the cost side of this same conversation, our full paid social agency cost breakdown covers what you should be paying for this work.
The short answer first
A paid social agency manages paid advertising campaigns on platforms like Meta (Facebook and Instagram), TikTok, LinkedIn, Pinterest, and Snapchat. That covers strategy, audience targeting, ad creative, campaign setup, daily or weekly optimization, and performance reporting.
That's the textbook answer. The real answer is more specific, and more damning for a lot of agencies.
Campaign strategy and account architecture
Before any ads go live, a legitimate paid social agency builds a structure. That means deciding which campaigns target cold audiences versus retargeting pools, how the budget splits across funnel stages, what bid strategy each campaign uses, and how the account is organized so it scales cleanly without cannibalizing itself.
This work happens once at setup, but it dictates whether everything after it is fighting uphill or not. An account built wrong from the start will have attribution problems, audience overlap, and budget inefficiencies that compound over time. We've seen accounts six months into a relationship where the structure was so tangled that the only real fix was to burn it down and start over.
The platforms won't tell you this. They'll tell you everything is fine. That's their job.
Audience targeting and segmentation
Paid social targeting is audience-first, not keyword-first. That's the fundamental difference between this and search advertising. On Meta, you're defining who sees your ad based on interests, behaviors, demographics, lookalike audiences built from your customer data, or retargeting people who've already interacted with your brand.
A good agency spends real time on this. They're testing cold audience variants, maintaining clean exclusion lists so you're not paying to reach current customers in prospecting campaigns, and building lookalikes off your actual converters rather than site visitors from two years ago who never bought anything.
A bad agency picks three or four interest categories from the first page of Meta's suggestions, sets it up, and leaves it.
Creative testing
This is where most paid social programs succeed or fail. Creative is the primary variable that moves performance on social platforms. The targeting can be solid, the budget appropriate, the structure clean, and you'll still plateau if the creative doesn't connect.
A serious creative testing process isolates one variable at a time (hook, offer, format, CTA), allocates enough budget per variant to reach statistical significance before making a call, and runs a clear system for scaling winners before they plateau and cutting losers before they drain budget.
What most agencies deliver: a handful of ads at launch, occasional swaps when performance drops noticeably, and a running claim that they're "testing constantly" with nothing to back it up.
According to Meta's own research, creative is responsible for approximately 56% of campaign performance outcomes, more than any other variable including audience or placement. That number should make you extremely skeptical of any agency that treats creative as an afterthought. Meta Business: Creative Best Practices.
Daily and weekly optimization
Active management means someone is in the account multiple times per week. They're checking pacing to make sure budget is spending efficiently. They're looking at cost per result trends and catching deterioration early. They're pausing underperformers, adjusting bids, expanding budgets on campaigns that are working, and making structural changes when something stops making sense.
The client-to-strategist ratio matters here enormously. One strategist managing twenty accounts can't give any of them meaningful attention. According to industry practitioners at Foxwell Digital, the upper limit for real account management is eight to ten accounts per strategist. Above that, things go on autopilot whether the agency admits it or not.
Platform-specific execution
The channels are different, and a generalist who treats them the same will underperform on all of them.
| Platform | Best for | What good looks like |
|---|---|---|
| Meta (FB/IG) | Broad consumer, DTC, lead gen | Knows when to use Advantage+ and when to override it |
| TikTok | Younger audiences, native creative | High creative velocity; ads built for the platform, not repurposed |
| B2B, account-based marketing | $8 to $15 CPCs require $5K to $8K minimum spend before useful data | |
| Pinterest / Snapchat | Niche use cases only | Pinterest for visual product categories; Snapchat skews 18 to 24 |
Meta: The largest paid social channel by reach. Best for broad consumer audiences, DTC brands, and lead generation. Advantage+ campaigns automate much of the audience and creative selection, which helps in some accounts and obscures what's actually working in others. A good agency knows when to use automation and when to override it.
TikTok: Creative velocity is the game here. Ads fatigue faster than on Meta, so the volume of new creative concepts required is higher. The platform skews younger, and content that's clearly made-for-advertising tends to perform worse than content that fits native TikTok formats.
LinkedIn: The highest cost per click of any major paid social platform, often $8 to $15 per click versus $1 to $3 on Meta. The audience quality is better for B2B, but the budget requirements are substantially higher before you see meaningful data. We tell clients not to expect useful optimization decisions from LinkedIn until they've spent at least $5,000 to $8,000 on a campaign.
Pinterest and Snapchat: Niche use cases. Pinterest works for specific product categories with visual appeal. Snapchat skews 18 to 24. Neither should be the primary channel for most advertisers.
Reporting and attribution
A paid social agency should be reporting results that connect to business outcomes, not platform vanity metrics. Reach, impressions, and video views are not results. They're byproducts.
Good reporting shows cost per result at the campaign level. ROAS or cost per qualified lead depending on your goal. Creative performance by concept so you know what's earning budget, and trend data over time so you can see whether the program is improving or holding flat.
The attribution question is genuinely hard on social. Platform-reported conversions almost always overcount because of cross-device gaps, view-through attribution windows, and overlap with other channels. An agency that reports only platform numbers without acknowledging the gap is either unsophisticated or hiding something. Google Analytics on attribution models is a useful reference for how cross-channel attribution should be framed. Most agencies that hide their metrics are doing it because honest reporting is uncomfortable.
We run paid social with structured creative testing, weekly optimization, and reports that connect Meta and TikTok activity to your CRM. Five to ten accounts per strategist, never more.
Get in touchWhat the average agency is actually doing
Here's the honest version. Most paid social agencies are not doing all of the above. They're doing a subset of it, on a schedule that doesn't match the cadence they described in the sales process.
The most common failure pattern looks like this: the onboarding is thorough, the first month is well-managed, months two through six gradually slide toward lighter-touch optimization, and by month eight the account is running on autopilot with a monthly report sent on the last business day of the month.
The signals that this is happening:
- Your strategist's client load is above ten accounts
- Creative hasn't changed in more than four weeks
- Reports show platform metrics only, with no mention of CRM or revenue data
- You've never had a call where the agency said something you didn't want to hear
- Optimization updates are reactive (after performance drops) rather than proactive
The last one is worth sitting with. Good agencies are calling you before performance deteriorates because they caught the early signs. Bad ones call you after it already happened and frame it as a challenge they're actively addressing.
Red flags to watch for
- Advantage+ auto-pilot without explanation. Some agencies set up broad automation campaigns and call it strategy. Ask specifically: what manual controls do you maintain, and why?
- No creative testing framework. If they can't describe the structure of their tests in concrete terms, there isn't one.
- Reports that don't mention what changed. A monthly report should include what was tested, what the results were, and what you're doing next. If it doesn't, you're paying for a PDF of screenshots.
- Vague answers about account access. You should always own the ad account. Always. An agency that runs ads from their own account takes your data with them when the relationship ends.
- One strategist on twelve accounts. Ask directly. A reasonable load is eight to ten. Above that, your account isn't getting managed; it's getting monitored.
What good actually looks like
We've run paid social for brands across retail, DTC, B2B SaaS, live events, and consumer apps. The accounts that perform consistently well share a few things.
- There's a real testing cadence. New creative concepts enter the account regularly, not just when performance dips. Tests are structured to produce actionable data, not just to check a box.
- The agency owns the attribution problem. They know the difference between what Meta says happened and what the CRM shows, and they have a working theory about why the numbers differ. They report both, without prompting.
- The reporting connects to decisions. Every report includes a "here's what we're doing differently next month" section grounded in what the data showed. Not aspirational. Specific.
- The account is clean enough that you could hand it to a different agency tomorrow without a three-month cleanup project first.
The bottom line
A paid social agency's job is to build and run advertising programs on social platforms that grow your business, not to generate a spreadsheet showing your reach went up.
The difference between a program that compounds over time and one that plateaus in month four almost always comes down to whether the agency is doing the real work. Structured creative testing, clean account architecture, honest attribution, and optimization decisions that come before the problem, not after it.
The bottom line
If you're evaluating agencies right now, start by asking what their creative testing process looks like in specific terms. If the answer is vague, the rest of the program probably is too. The Tuesday-afternoon question separates real management from monitoring.
If you want a direct read on how we approach this work, see our paid social management page or get in touch.