Hi Lisa,
I work as Social Media Manager, and I know everything is getting mixed up by now, but social is now touching many different areas as is a direct way to interact with audiences, so I am expected to have a content strategy specifically for social networks, that is not completely independent from the main messaging / corporate content strategy, but adds up more specific content, tone of voice and tactics targeted for for each social network, you cannot communicate the same message in Facebook than in LinkedIn, or Wikipedia, because each network has its own uses and set of rules, hence is that sometimes a specialist is required. also social media content is based on trends and insights from social listening platforms, so content is shaped accordingly to user needs and interests for it to become popular, or "viral", it even is produced in conjunction with influencers.
Also, I am also dealing with other areas as customer satisfaction, CRM (as now socialCRMs are in use) and need to report on insights on the company, optimise campaigns, feedback on products and services as Social Media is an open window for understanding better customers and audiences.
Hope this helps,
Paola