SMM stands for social media marketing, and in practice it covers three things: content, conversation with followers and advertising. People use the term for all of them at once, which is why it is worth saying which part you are buying.
Content answers the questions a person asks before buying: what is this, how much does it cost, who is behind it, can I trust them. Conversation shows that real people stand behind the page. Advertising brings in people who haven't heard of you yet.
This page is about the first two: we run the profile in your place. If you already have someone who posts and replies and only the words are missing, we write social media copy separately. If you need new people rather than content, see Facebook and Instagram ads.