I think the answer is in the name: "social" media. Most (99%) people use the Internet most (99%) of the time to see or hear what other people are up to. The bi

I think the answer is in the name: "social" media. Most (99%) people use the Internet most (99%) of the time to see or hear what other people are up to. The big sites are where all the other people are. QED. (This comment falls into that space)