All the social media platforms should be used with care - they are all based around exploiting insecurity and your need for approval. They blur the line between acquaintance and friendship - people should beware of exposing the minute details of their lives to anybody, let alone people that (if they are honest) they dont really know, but are too flattered to decline a request from.
The biggest improvement these sites could make is by removing the thumbs up and thumbs down buttons. It shouldnt matter whether anyone approves of your post - its your thought - and its just as valid as anybody elses thought - and quite honestly nobody has the right to police what goes through another individuals mind.
That little thumb icon is the biggest psychological warfare weapon on the planet right now - it carries the very real potential of social exclusion or maybe, just occasionally, hero status. But its like a drug...its a numbers game and people wonder why x number of people either have or havent liked something.
These platforms ought to increase our ability to keep in touch but im starting to wonder if for many people they are actually contributing to their isolation.