What a social media marketing agency actually does
A real agency owns four things: content strategy (what to post and why), content production (design, video, copy), publishing and community management, and paid amplification with reporting. If a proposal is only about posting a fixed number of creatives per month, you are buying a design vendor, not a marketing agency.
The strategic layer is what you are paying for: which platforms matter for your category, what content pillars fit your brand, how organic content feeds paid campaigns, and how social connects to actual revenue rather than vanity metrics.