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You pay once to sign up, this fee increases with the ammount of users.

yep. pinboard has both a "pay us one-time" model for bookmarking and an "annual-fee" model for special features like pdf archives.

That seems reasonable and fair, then again I'm sure he can pull it off well because as far as i know pinboard's a one-man bootstrapped company.

lol thanks, I'm so tired that I read (and then typed) pinboard as Pinterest. heh