What does it mean to 'follow' someone on Facebook?

[matthewfein]

I was looking at a page of one of my Facebook friends, and it had this section that said: 'followers'.. Can anyone tell me what a 'follower' means on 'Facebook?'

[Pooface]

You'll be able to see their statuses but they won't see yours.

[Liz]

it means, rather you are friends with them or not (based on if they block their stuff from non-friends), you get notifications on when they add a photo or something like that.

[Gary]

it means to always listen to their tweets, blogs and or random rants, each and every time they feel the need to share.