I think the bigger problem is enforcement. If someone says "I'm not accepting your request because you're X" that's easy to detect and punish. But if it's more

I think the bigger problem is enforcement. If someone says "I'm not accepting your request because you're X" that's easy to detect and punish. But if it's more subtle and no explicit reason, it's going to be way harder to detect and adds a lot of judgement calls to the mix.. which puts it up the whims of whoever is doing support at that moment. I wrote on this last year on how it could be totally transparent and devastating as a result: http://caseysoftware.com/blog/social-apis-for-social-evil http://caseysoftware.com/blog/social-apis-for-social-evil