Twitter I can't comment on because I find it's functions to be useless personally as I don't follow celebrities and I'm on the internet so often I don't need to go far to keep up on any current event.
As far as Facebook and business are concerned the advertisements that are generated via facebook are almost all things that I'll outright ignore and the few I don't are things I was already aware of.
That said, there are a few companies out there that I was unaware of until a friend or two on FB 'liked' them or commented about them that I then went ahead and did my own research on, most of which I have either purchased from (directly, not via FB) or would likely purchase from if I need their products.
I know it's not exactly the answer you're looking for but I felt it was on-subject enough to possibly be of at least some help.
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