I created a fan page for myself on Facebook, and several friends and family have asked why. It’s not like I’m a celebrity like other folks with fan pages, and it’s a little creepy to suggest that I am.
I suppose I did it for four reasons. First of all, I created the page because I can. Facebook gives anyone the opportunity to create fan pages about anything.
Second, if “Staying Up Late” can have fans, why can’t I?
Third, some of my current students have requested to be Facebook friends with me. I am still on the fence about whether or not it is appropriate for a professor to be Facebook friends with students, but I am more comfortable with students having access to a different Facebook page about me if they want. So, they could be “fans” of Jim Y. Trammell without being “friends” of Jim Y. Trammell.
Finally, there are several people with whom I am Facebook “friends” that I would say I am a fan of as well. In fact, I consider myself a fan of several my close friends whom I’ve had for decades. I love them so much that I eagerly follow their goings-on with teeny-bopper fervor. If they created fan pages I would certainly be one of the first to sign up. I’d even be the fan club president for some.
So that’s why.
Jim Y. Trammell's Blog 
Over your career, you will have made contact with far more than 5,000 students. 5,000 is the Maximum friends that Facebook allows at this time. A FanPage is totally unrestricted,
It’s a wise move in the long term.
This allows you to have Facebook for family and close friends and Facebook Fan Page for everyone else.
A lot of Internet ground breakers are doing the same. It’s wise to start now as opposed to de-friending people down the road.
I did it for the same reasons!
Plus I wanted to have more fans than you