Is anyone here using any of these? I just signed up for BigDoor. To me, I think Reputely has the best website - I like how they use the phrase "game mechanics"

Is anyone here using any of these? I just signed up for BigDoor. To me, I think Reputely has the best website - I like how they use the phrase "game mechanics" since I already know what they are, and what the value is.