Foursquare - The map in the landing page is the map of your actual position
/via bluboy

Foursquare - The map in the landing page is the map of your actual position

/via bluboy

Colllor - The favicon changes to match the chosen color
/via Tom

Colllor - The favicon changes to match the chosen color

/via Tom

Github - The private label of Github adjusts its angle with an animation to fit your browser window.
/via Phil

Github - The private label of Github adjusts its angle with an animation to fit your browser window.

/via Phil

GitHub - shows an infinity symbol when the number of notifications is over 800.
/via steffen

GitHub - shows an infinity symbol when the number of notifications is over 800.

/via steffen

Gmail - Selecting an email in Gmail and then shift clicking on an email below it will also selects all the email between them.
/via Guy Malachi

Gmail - Selecting an email in Gmail and then shift clicking on an email below it will also selects all the email between them.

/via Guy Malachi

Facebook - The icon for marriages is automatically based on the genders of those involved.
/via Sam

Facebook - The icon for marriages is automatically based on the genders of those involved.

/via Sam

Facebook - When you type in the correct password with a slightly incorrect username, it will prompt you with the correct username and ask you to retype the password.
/via Xianhang

Facebook - When you type in the correct password with a slightly incorrect username, it will prompt you with the correct username and ask you to retype the password.

/via Xianhang

Asana - Offers an alternative text-only how-to instead of just the video.
/via pvermaer

Asana - Offers an alternative text-only how-to instead of just the video.

/via pvermaer

Foodivide - When you try to sign up for their newsletter with the same address twice, they appreciate the enthusiasm./via Shein 

Foodivide - When you try to sign up for their newsletter with the same address twice, they appreciate the enthusiasm.

/via Shein 

Pinterest iOS app - Scrolling down hides the top bar and scrolling up makes it appear again.

/via midweekcrisis