I've identified 4 kinds of social media users:
- advertisers,
- students and mums keeping in touch with (family) friends,
- entrepreneurs, bloggers, artists, and so on, trying to promote their "brand", and
- outcasts, looking for psychotherapeutic listening (deep, non-judgemental)
Microblogging was a bad idea not only in its usual "Twitter" user farming-inspired implementations but also because as the concept it is, it intrinsically conflates the last three use cases. However I'd like to suggest as well that social media can be genuinely good because they isolate people in small clusters, and this helps them to keep in touch with their relatives. Of course it's pretty bad for sharing online resources to a large number of people, this is why we've got blogs and Gemini, RSS/atom feeds, and links.