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You just sent your entire email list to his servers.

You sent an HTTP POST to http://dcurt.is/stealing-your-address-book/add_kudos. This results in incrementing the "# KUDOS" number under the dot. He seems to have built his own "like this" button, essentially, with a like counter.

I did this as well, it seems very obvious but it's a great insight in human behaviour.

Gave "Kudos" it seems. Kinda like a +1 or thumbs up.