Ok, you have to check this out:
http://www.chattotext.com/amember/go.php?r=6393&i=l0

It’s a 5-minute video about a brand new tool you can add to your social network page (works now with Facebook and Bebo, and soon MySpace). You just add it to your profile page and your friends can send you a private text message to your cell phone, and you can reply with your cell phone and they’ll get it while they’re still on your profile page!

It’s called Chat To Text.

It’s all explained in this video:
http://www.chattotext.com/amember/go.php?r=6393&i=l0

I’ve installed it on my Facebook Page, and it works great!