- Make location field required
- Do not show URLs in profile publicly for TL0 members
Comparing specified location and IP location is a great tool in fighting spam (often the location as specified as west, yet IP is east)
Often spammers signup, put a URL in profile, then make one post to make it look real. Hiding profile links of TL0 users is a nice strategy. However I think this may need to be an admin option for TL1 too (since it is fairly easy to get to that).