Kickstarter - Visiting an empty section of your own profile suggests that you back projects in that category./via Simon Souris

Kickstarter - Visiting an empty section of your own profile suggests that you back projects in that category.

/via Simon Souris

Google+ - Guesses where a user might work based on where their friends work.
/via Artem G.

Google+ - Guesses where a user might work based on where their friends work.

/via Artem G.

Confluence - Username is auto-populated as you enter your email address, and stops when @ symbol is typed. 
/via Brian

Confluence - Username is auto-populated as you enter your email address, and stops when @ symbol is typed. 

/via Brian

Instructables - Offers a variety of gender options when signing up for an account
/via Vonn

Instructables - Offers a variety of gender options when signing up for an account

/via Vonn

deviantArt - Visual prompt to encourage users to fill in more details about their profile when registering.
/via Benje

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 - 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

Google+ - Clicking on someone’s profile picture makes it flip around to show previous pictures. 

/via Alex Popov