temporary profile picture

 temporary profile picture  is a profile picture that expires after a set amount of time and reverts to the previous profile picture.

Facebook
Facebook allows you to set a temporary profile picture, selecting when the photo should expire. It appears to only be supported with their mobile apps. https://www.facebook.com/help/816899741763786

Articles

 * 2015-09-11: Facebook tests temporary profile pictures for supporting causes - The Verge