I don't use it- I don't have time for all the drama it brings to my life (my life's all ready challenging)

I used it years ago, because it had some pretty good mental health groups on it (Facebook this is), but it depressed me- seeing how together everyone was compared to me and how people were just getting on with things, so I quit using it

I left eventually after an argument about an earthquake- one of the major ones they showed on the news at that time

as for twitter, well I used it briefly to interact with a friends radio station- but the friend got quite irate about the fact I was " too interactive", and she sort of drove me away from it