Apparently this is not a joke. Learn about the bacteria in your body!

Wow that's a lot of bacteria.

Note that uBiome is a for-profit company and it's unclear what they do with your data:

http://pandawhale.com/post/49263/ubiome-raises-45m-from-angel-investors-andreessen-horowitz-to-crowdsource-microbiome-research

American Gut Project sounds better:

The company’s goal, apart from giving people a way to see what’s in their gut, is to provide this data to researchers so that they can look at microbiome on a grand scale.

There are a few other projects dubbed “citizen science” that work with microbiomes, such as the American Gut Project, the kit for which costs $99. But the proceeds go to the Biofrontiers Institute at the University of Colorado-Boulder and the Earth Microbiome Project at the University of Chicago.