Facebook sharing and referral links. Is there a happy medium?

[JDatSB]

We have a website with a large member base where users share content a lot.  But the SEO problem I have, is that every share needs to reflect a "referral link" so that if a new user signs up, the original sharer receives "referral" credit for that sign up.

I really want to be able to take advantage of our huge member base and their sharing, but I'm finding it difficult to do so because each user shares a link that has their referral in it.

Can anyone think of an SEO friendly method of sharing that both gives our site SEO benefits, as well as providing the referral credit back to the user?

[ChristopherGlaeser]

Will rel=canonical do what you need?  In other words, the user with ID 1234 would post the link http://www.domain.com/page?ID=1234 where page contains the meta tag

Best,
Christopher

[JDatSB]

That might work.

The way our tracking links are setup, it's domain.com?ref=1111&goto=/this/path

then it redirects the user with a 302 to domain.com/this/path

Would changing it to a 301 be damaging because it includes the referral link and isn't a natural backlink?