Now we're getting into some interesting 'philosophical approaches to social media' discussion which I love
Personally, I always thought Twitter was the most ridiculous form of social media, but as the Facebook algorithm/powers-that-be filtered out artists I actively chose to see, I have shifted my approach because I don't think they filter posts out (to my knowledge). Further, I used to dislike Instagram too. I used it for my student to follow me and I'd post news, charts, data for them to hopefully think about outside the classroom. At some point, we were discouraged from that so I deleted it. I just rejoined for increasing the cute factor. I can't imagine deleting Facebook, I find it useful for keeping up with distant friends from all walks of life (childhood, academic studies, current musical circles, older punk friends, coworkers old and new, family, etc.). I have tried to curate that by unfollowing people who add little to what I also really value it for: news. The people I unfollow end up posting stuff that doesn't make a lot of sense (postmodern/meaningless/'dank memes'), endless selfies, or reposting the sort of stuff that is just irritating things like games, quizzes, 'I bet you won't repost that you...' That said, I have a lot of pretty brilliant friends that post really interesting articles. That raises the question of 'the bubble' and I do wish more of my conservative friends offered their thinkpieces, but they just don't, but I have a lot of centrist friends and even that helps me understand the mind of a different type of person But I still feel like there's a worthwhile range of discussion that has added to be understanding of the world's current events and trends, etc.
So, my most recent approach has been:
Facebook: use for friends and general news
Twitter: use for music 'promotion', music news (that FB seems to filter out more and more), and general news
Instagram: use for hedgehogs, dachshunds, and synthesizers
G+: I'm in a small discussion group for music stuff, but otherwise, I don't use it and it really doesn't make sense. I'm not surprised it never caught on.
I don't really participate in much discussion on MW because I don't know that I'd add much. I use it much more as an observer. I just checked and I joined in December of 2012 and I have 148 posts. So yeah, I'm pretty quiet but still check it regularly