Not necessarily. The core of twitter allows anyone to "follow" anyone else. Whereas for facebook, you need to first become a friend of that person before you

Not necessarily. The core of twitter allows anyone to "follow" anyone else. Whereas for facebook, you need to first become a friend of that person before you start getting updates. People on twitter easily have thousands of followers even though most of those aren't "real" friends. You could probably do that with facebook, but it would defeat the purpose of having friends & family on there if 95% of your friends were random people on the internet that just wanted to follow your status updates.