There is a new Facebook app that shows which of your online friends are down with a one-night stand. 

Bang With Friends claims to help users "anonymously find friends who are down for the night" by pairing up any that are both attracted to each other.

But it's really not anonymous, since it shows prospective users which of their friends are already using it before signing up.

So far, 2,500 people have signed up to use the new app.

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