Sophmom has a great post here about social media. Here's an excerpt:
When I hear my contemporaries dismiss social media, primarily as a "time suck", I hear an old fogy shouting "Get off of my lawn!" Refusing to learn for no good reason smells of fear, smells of failure to grow, and rationalizing it as somehow right to think that way smells of self-deception. Twitter gets called "narcissistic" more than other platforms, and it's a common whine, "Why would anyone want to know what you're doing/eating/seeing/etc.?" Except that's the point when "etc." includes thinking and you use Twitter not just to follow people but to follow ideas, subjects of interest, current events, other media, even television. In most areas of our lives we are bound with others by the things we have in common: our geography, our social stations, our ages, our activities or those of our children; but in each of these there are clear signals that create preconception: how we look, where we live, what we wear, what we drive. It's different when we interact on social media because there we choose connections largely, if not entirely, because of shared ideas; and on Twitter, unlike some other fora, we can follow the ideas first as a path to find the people with whom we wish to connect.