I would look at what happens when a user signs up. Do you send them a nice e-mail that says "Thanks for signing up, give it a try!" and encourages them to try?

I would look at what happens when a user signs up. Do you send them a nice e-mail that says "Thanks for signing up, give it a try!" and encourages them to try? Or is it just a 'Thanks for signing up, click here to confirm your account." This makes a big difference. I've noticed that one of the competitors to our startup sends an e-mail 1 week after the user registered saying "Hey, have you tried it yet?!" etc.