The ever growing Public Lab community uses diverse social media channels--the Media Working Group works to repost/retweet/and generally promote member content on organization pages. Contact the Media Working Group at media[at]publiclab.org. 

Our Facebook page: http://www.facebook.com/PublicLab

Our Twitter account: http://twitter.com/publiclab

Our YouTube playlist: https://www.youtube.com/watch?v=cJjz7ULFtv8&list=PL2248679264CB236C

On Flickr, everyone uses their own account for uploading pictures; by simply tagging them "publiclab" they will show up in the Flickr stream: https://www.flickr.com/search/?q=publiclab&s=rec
Also see https://www.flickr.com/search/?q=publiclaboratory

This website: Social media is integrated into http://publiclab.org: each wiki page has links to "facebook share", "tweet" and "+1" so you can share on your own channels.