How to add social networking logos to profile fields?

I would like to get some input on how to have social networking logos show in the member profiles. (twitter, myspace, linkedin, friendfeed, etc)

EXP: In my "social networking" profile fields I ask for their profile url from whatever site. They add their url in the profile field.

Right now the URL shows up as http://whateversite.tld/profile/etc

I would like to have the logos for each social networking site show instead of the http link.

Looking for a little guidance on the best way to accomplish this.