Kickstarter - Visiting an empty section of your own profile suggests that you back projects in that category.
/via Simon Souris
Confluence - Username is auto-populated as you enter your email address, and stops when @ symbol is typed.
/via Brian
deviantArt - Visual prompt to encourage users to fill in more details about their profile when registering.
/via Benje
Google - Google wishes you happy birthday based on the information from your Google+ profile. Clicking the doodle sends you to your profile at Google+.
/via Alexey Gornostaev
Google+ - Clicking on someone’s profile picture makes it flip around to show previous pictures.
/via Alex Popov




