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You can earn activity points by filling your profile with information about yourself (what city you live in, your favorite team, blogs etc.)
Watching the bid/ask is amazing. I saw a sale go through taking out the ask, and almost instantaneously the ask was replaced by a higher number and then by a number lower than the taken out ask. That's definitely not manual inputs- more like a program told to put in a lower ask if the offer got over a certain number.
