Remove "www" link from user profiles

[pdpinch]

As an admin, I'd like to see a reduction in the number of spammy user profiles (see #3798).

We can reduce the value of spammy profiles by removing the user-input "www" link from the rendered profile.

We don't need to remove the data at this time, but removing the link should discourage the spammers. At a later time, we can consider methods to "scrub" the links and restore them for legitmate users.

So far, I haven't seen any spammers abuse the "social" links on the profile. If we do, we can consider removing those as well.