Giving Tuesday Tweets, Instagram Photos (SLIDESHOWS)

Black Friday and Cyber Monday have a third act, and it’s called Giving Tuesday.

The nationwide initiative, launched by New York's 92 Street Y and the United Nations Foundation, kicked off on November 27 and encourages acts of giving just as the holiday season rolls around.

Will Giving Tuesday become a new holiday tradition? Check out the slideshows below to see how the movement has taken off on social media!