Avoid false claims of equivalence

[evanp]

The Social Graph API had this whole graph model for showing who claimed to be whom and whether those claims were mutual and so on.

So if http://example.com/l4mer has a rel=me to http://twitter.com/justinbieber but not vice-versa, we keep that data, and don't automatically return http://example.com/l4mer if someone's asking about @JustinBieber.

Yeah, I know.

Anyway: I think we should only include equivalence (A = B) in these two cases:

• Mutual rel=me links.
• Data from trusted sources. People who've logged into Identi.ca with their Twitter or Facebook accounts, for example.

There are probably some other interesting things we should include (circular equivalence (A -> B, B -> C, C -> A) probably would be good, for example), but I'd like to keep it simple for now.