Profile personal Facebook / twitter icon button Links

If there isn't Already, Is there a way that on each members profile that they can set a link for their Facebook twitter and other various social networking accounts example John Joseph Splurgin Johnjoseph@splurgin.com Staten Island 22 [ F ] <-- Facebook Icon 32x32 / Button that they can manual set their profiles URL to example: www.facebook.com/splurgin ?? Very interested hope someone can assist me !!