Pinboard: How many users are using the service?
tl;dr Pinboard has 9550 users.
Pinboard charges a one-time signup fee of $9.55 for new members, the fee is based on the formula: number of users * $0.001, so the current number of users is $9.55 / $0.001 = 9550 users.
Reference: https://pinboard.in/help/fee/
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A little more:
http://news.ycombinator.com/item?id=2302595
http://news.ycombinator.com/item?id=2302547
WRONG STATEMENT: I believe that the person running pinboard mentioned that it started at something like $3 or maybe more, so it isn't 9550 but probably a bit less, even less if you count inactive users.
http://blog.pinboard.in/2011/09/the_costs_of_bookmarking/