Social networking sites like Facebook and MySpace have forever changed the way people interact with one another online, but if you’re looking to put a little more “eco” in your “friendly,” check out these top 10 green social networking sites from Earth2Tech:

1) Carbonrally: Founder Jason Karas launched the site in mid-November and now has almost 2,000 active users and has had 20,000 visitors. Unlike a lot of the sites out there, Carbonrally doesn’t focus on raising or donating money or using carbon calculators, instead it uses the draw of being on a team to help members focus their efforts on challenges that reduce carbon emissions.

2) Zerofootprint.net: The Toronto-based company creates branded carbon calculators and community sites for cities and large organizations, and back in May 2007, when there weren’t that many carbon calc sites out there, the startup launched its first branded site with Toronto.

3) MakeMeSustainable: As the name suggests, this site is basically a personal workout to reduce your carbon footprint. The Manager section monitors your carbon emissions over time via actions you’ve taken like Joining a carpool or ‘Installing better power management on your PC. Then there’s a social-networking component where you can join user-created groups and see who’s involved in the site in your local area

4) Celsias.com: The Celsias blog became a social network community site for climate change-fighting advocates in January. Celsias organizes its community around Projects that users can create and join.

5) Change.org: The do-gooder social network, launched by Ben Rattray in February 2007, offers a variety of philanthropic actions to focus on, but highlights several green projects like End Dependency on Oil, and Stop Global Warming. Rattray says that the site has just over 110,000 users, is growing at about 4,000 new members a week, and the team is currently preparing for a major relaunch over the summer.

6) WorldCoolers.org: WorldCoolers is a browser add-on made by marketing company Collactive that alerts you to news and announcements on global warming. The site also has a section for online campaigns and a blog that was in hiatus for about a year.

7) BigCarrot: Are cash prizes the answer to the world’s problems? BigCarrot.com is looking to turn the trend of offering prizes for innovations (such as the Auto X Prize and Virgin Earth Challenge) into a distributed community project. Individuals can pool their resources into a cash offering, which they can then doll out for goals like bringing greywater recycling systems to communities or building a language-teaching web app

8 ) Care2.com: Care2 is an example of a mainstream green community site that got in on the Internet’s do-gooder focus way early it was launched back in 1998. And thus it’s been able to bring in a sizable user base over that period of time. The site claims to have 8 million members, and Compete says it has 1 million unique visitors.

9) 2People.org: 2 People gets its name from the motto: How do you move a nation: 2 People. The site trying to organize people around climate policy, through its Focus the Nation - Climate Dialogues and Climate Elections 2008? initiatives. Getting people motivated around climate policy and education is crucial, particularly this year.

10) BeGreenNow: While this site is a little sparse on innovation, it was created by Austin, Texas-based clean-electricity provider Green Mountain Energy, so it’s interesting to see how companies are using green community sites to market themselves. It’s got a carbon calculator and ways to offset your carbon emissions.