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I've now twice gotten the following notification on Area 51:

Welcome to Stack Exchange Area 51!

user thought you'd be interested in this proposed Q&A site. If you like the idea, you can click the "Commit" button below to be notified when the site is created.

both for a proposal that I was already committed to. How do these notifications work, how can I send them myself? And are they only displayed if you visit that specific proposal?

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up vote 3 down vote accepted

It's a referral.

To refer an user to a a proposal, you just have click the Share This button under the Commit or Follow button of the proposal. This is will give you a link with your referral ID. Anyone that arrives to the proposal through that link will get that notification and earn you reputation if they commit or follow.

For some reason I don't understand, you have to at least follow the proposal to be able to refer. Otherwise, the Share This button won't be there.

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Aha! I must have followed some referral links without noticing it. Some of the links to the proposals in the discussion area must be referral links. – Mad Scientist Jan 31 '11 at 10:51
@Fabian: That's correct. If you're going to drop a link, why not make it a referral link for the same chance that it earns you some extra reputation? – Borror0 Jan 31 '11 at 10:55

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