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Pi is a new digital currency being developed by a group of Stanford PhDs. For a limited time, you can join the beta to earn Pi and help grow the network. To join Pi, follow this link

This looks interesting, my invite code:

neant

I have been mining for a few weeks now, might be worth nothing or it could be big
either way it is free for now.
it also is not a proof of work thing so is very low on phone resources or battery usage IMHO.

invite code: plus