Twitter followers: Here’s a low maintenance way to increase Twitter followers; at Sets you sig up using Twitter, so the only reasonable thing is to ask the user if you want to follow their Twitter account right then and there.

Sign up form: I like Qio’s very visual way of showing “hey we’re free to get started”. 

Sign up: Wavii’s (@wavii) implementation of an incentive driven sign up process. 

Easy account creation: Stripe (@stripe) lets you easily create an account by just saving the demo profile you just visited. 

Sign ups: Asana (@asana) shows you the progress you have already made to being signed up. 

If you’re anything like me, you will hate every single additional step to sign up, Asana show’s you the evidence of how you’ve already made progress and are almost done signing up. 

If you’re interested in psychology tricks like this one, check out Yes!: 50 Scientifically Proven Ways to Be Persuasive

Ask your potential customers: Photoshelter (@photoshelter) ask their visitors on the Tour page what their top questions are before signing up. 

Sent in by Stock Performer.

Sign in vs. Sign up: Quora’s sign in process shows you if the email address you’re typing in has an account associated with it. Otherwise a sign up link pops up. In case your email address has been registered before you get validated with your avatar next to the form.

User registration: Friend.ly uses facebook data to make it easy to sign up with prefilled forms whenever you open the site in your browser. All you need to do is adding your current location.

Additionally it displays how many of your friends already signed up (social proof).

Signup page: Sugarhigh adds a 24 hours expiration tag on its invite only sign up adding some sort of urgency and importance to the service.