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This site is using an interesting signup strategy. It opens the signup window at a random time once a day and for only 15 minutes.

Anyone have any other examples that are like this?

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LittleGreenFootballs (a semi-political blog) has used random account creation windows for the last several years, to my understanding. It seems to heighten urgency, create a sense of exclusivity in the blog commenting community, and achieved the original goal of putting a big barrier in front of trolling the site. (You have to keep an eye on it for weeks, snag an account, THEN troll.)

I don't think I'd ever implement this myself, though.

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