What is needed for RDF is an SHA1 hash, as described in the FOAF standard. Using anything else is a complete nightmare interoperability-wise.
The best option here is to find a public repository that doesn't require a username and password. Most open source repositories have anon public repositories that anyone can access, does yours not?
Wikipedia has a responsible definition: http://en.wikipedia.org/wiki/Kudos
It was linked to from http://www.ohloh.net/posts.rss before the post was pulled and some RSS aggregators save items until they're read, so I read it in my RSS reader days after it was pulled.
RSS is good, deleting SPAM is good, checking that links published in the feed still do something sensible when the forum post has been deleted as SPAM is even better.
Example: http://www.ohloh.net/forums/3491/topics/1758
Generally ohloh links back to the original open source project and the project holds the contact details.