Contact fields

Hey, I'm trying to do something here.. Not sure if it's possible...

I have set a Profile field, say mine is 'TheTubeScape'. I then have a Contact field with a default value. Is it possible to put the content of the profile field (TTS) added to the end of the URL for my contact field?

Also, my default value is invalid, as each user has to edit it to put their name in. But this makes the icon appear no matter what. Is there a way to only make the icon visible if something is added to the end of the URL?

Thank you.