Pokerstars one billionth hand bonus

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What is it? Sorry if it has been covered, I did a quick search and didn't see anything.

Anyway I was on the site and got an email that said I got credited 25 bucks for the one billionth hand bonus, I looked at my bankroll history and haven't made a deposit in at least 5 months, only withdrawls.

Any ideas what that was?

Thanks