I live the exchange on @actifit . You trade 20 afit for a $1 upvote to a an @actifit post. When you get that vote you receive more afit than you spent for the vote. It's awesome. I average about 2 to 3 of those $1 upvotes a week. When I started doing that I had 7000 or so afit and no I have 12,000 after trading them in as fast as I can. It's been awesome!!!!!!