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Yes, this is the thing I like there least, one can't have a clue who is signing up and who is not.

I agree, I like knowing who my signups are and where they are from.

I guess with CryptoTab we will have to live without, but... those 10 levels kind of make it up for it. They have added those extra levels to assure as fast growth of the pool as possible and to attract to CryptoTab not only free Satoshi hunters but also affiliate marketers. I think that was a smart move, they are growing fast :-)