Facebook is great for “liking” your friends’ status updates. Twitter is ideal for keeping up with your favorite celebrities. YouTube’s the best way to find a video clip of a cat hanging by its claws from a tree. But social media sites like these, and the dozens of others that exist, have uses far beyond just chatting with friends and killing time online. For businesses, they are the newest and hottest way to get people interested in — and buying — their products. Read more.