My Facebook is just so I can follow the kids, I don't post anything. New Hawaii pix, new quidditch pix, LARPing posts, music posts, it all gives me a window into their lives since leaving home. DH posts more now that he's no longer teaching - he kept a pretty tight lock on his FB settings since he was at an alternative school. My sis deliberately doesn't use social media, most likely influenced by her job (her choice, not forced), so I am a bit more inclined to less social media than more.
Ironically, I handle the social media at work as part of my duties. I have to be aware of public perception, so I can't like things I may want to all the time. I enjoy Twitter much more than FB at work, because we follow news and sites like Smithsonian, as well as fun topics like coding for kids.
Pinterest is probably my real addiction - I have personal and work accounts that I follow often, pin tons, and I have several boards I've linked between the two accounts so I can send pins between them easily when logged on the other account. It doesn't feed my wants, I just use it as it was designed - as a virtual pinboard for stashing all the interesting and someday-useful stuff I run across. If anything, it probably stifles my wants - I've pinned way more stuff than I can ever get around to someday (think knitting patterns and cookie recipes), so it acts like a virtual stash of "stuff" that costs nothing and takes up no physical space. For work, some boards are intended for the public (book club, new movies, e-book links, etc), while some are set private and I use them to brainstorm. I'm constantly torn between too many pins per board vs too many boards, so I keep pestering the Pinterest people to allow nested boards for better hierarchical organization.