A few things to make sure to do. First, have high quality content—high quality profile pictures, fun videos, and a compelling story work wonders. Second, promote your page to Facebook, Twitter, and Email as often as you can. Share any new results, stories about training for your Thon, video updates, etc. Third, make sure to share personal and fun information. Your friends will all look and laugh at the idea of pledging $1/hot dog for that Mission Trip you are going on.
Lastly, always Thank your donors!