Twitter represents 100 million people who are freely sharing their thoughts with the rest of the world (you don’t need to be “following” someone or logged in to access >99% of tweets), but these thoughts are refined to 140 characters, and typically aren’t very intimate. Facebook, on the other hand, gives you no-holds-barred access to the personal information of your friends, but this group usually doesn’t exceed 1,000 people. And so we’ve ended up with two very different treasure troves of data: a little information from a lot of people in Twitter, and a lot of information from only a few people — from a given user’s perspective at least — in Facebook.
via yalelawtech.org