Happy Earth Day! Here are some great examples of companies embracing Earth Day via social media.

1.  NASA is using social media to promote Earth Day from an astronaut’s point of view. Astronauts have captured some of the most astoundingly beautiful images of the earth, therefore, NASA is encouraging its followers  to take an outdoor selfie as part of the agency’s #GlobalSelfie campaign.

You can either post your selfie to NASA’s Facebook, Twitter, G+, Instagram or Flickr account or share it on your own account with the tag #GlobalSelfie on April 22. The agency will use the images gathered to create a mosaic image of Earth that will be released in May.

2. TDS Telecom has deemed April, Earth Month. Throughout the month of April, TDS has posted tips for a greener office on Facebook, Twitter, LinkedIn & Google+. Their blog has had several Earth Day themed posts throughout the month and they even changed their cover photo on Facebook to reflect the initiative.

3. Mashable is encouraging its followers to honor Earth Day, socially:

“This Earth Day, whether you take a moment to just appreciate the flowers on your walk home, or teach a kid how to be a little more conscious of their impact on the world, please share that moment with the Mashable community. We’d love to see your photos, Vine videos, Snapchat doodles, and Instagrams, and we’ll round-up the best throughout the day. Just be sure to add the hashtag #MashEarth when you post!”