Do you know about Maholo site

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hi mylot friends, as usual,i have joined in Mahalo site,long back itself and not participating in it regualrly,recently i am getting mails from Mahalo site about badges,i does not know about the badges and other things in Mahalo,how to participate in Mahalo site and how to earn in Mahalo site,and about Mahalo badges also,have any one know about this Mahalo site?