I added a psn icon and xbox icon to the postbit but u can add what ever icon u choose.
These can be hyperlinked or just displayable when you hover over
1. Create a image.png, make sure its set to 24x24 pixels and upload it to your root/images
2. Create a new user profile field set it to single line and make sure private field, Field Searchable on Members List and Show on Members List are all set to NO.
Remember the Field ID
now open up ACP> Styles & Templates> Search in templates
Search for postbit in titles
Now depending on which one your using you will have to either edit postbit or postbit_legacy
now search for {vb:raw post.icqicon} {vb:raw post.aimicon} {vb:raw post.msnicon} {vb:raw post.yahooicon} {vb:raw post.skypeicon}