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.

Huffington Post Impact's Giving Tuesday series features ways organizations and bloggers are getting involved and what you can do. And more than 2,000 charities, businesses, religious groups and more have come together to support projects that benefit at least one registered 501c3 nonprofit.

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

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  • I'm helping inspire imagination, creativity, and innovation! #GivingTuesday

  • #GivingTuesday #squareonesidewalkcafe

  • Mrs.Barnes and I!! #givingtuesday!

  • Today is all about giving- be selfless! I'm giving back by supporting Project Happiness! #GivingTuesday www.projecthappiness.org

  • Have you given yet?! #GivingTuesday #doneanddone

  • We've had #blackfriday and today's #cybermonday, but we're really excited about #givingtuesday!

  • Delivering to #Cisco for #givingtuesday #lwrcisco @gwinnetttech #mosaic #gwinnett @rotary

  • #GivingTuesday

  • What will you do to help shift the focus? Get out the Give #GivingTuesday

  • Join the movement. November, 27, 2012. #GivingTuesday

  • #GivingTuesday in Delaware

    <a href="http://www.huffingtonpost.com/social/Angela_McCloskey"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/1182475787/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Angela_McCloskey">Angela McCloskey</a>:<br />#Giving Possibilities

  • Amanda Wyss #GivingTuesday

    <a href="http://www.huffingtonpost.com/social/alohalife"><img style="float:left;padding-right:6px !important;" src="http://images.huffingtonpost.com/twitter_profile_img/1520663.png" /></a><a href="http://www.huffingtonpost.com/social/alohalife">alohalife</a>:<br />Actress Amanda Wyss shows her support for #GivingTuesday

  • National Aquarium

    <a href="http://www.huffingtonpost.com/social/Nabila_Chami"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/1563600307/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Nabila_Chami">Nabila Chami</a>:<br />The National Aquarium's Marine Animal Rescue Program helps to care for and rehabilitate seals, sea turtles, dolphins and whales along the Atlantic coast year round! They depend on the generosity of volunteers and others to continue their important work!