I would really appreciate that, because I had no clue what organization to enter in the sign up form (will I be able to change it later? can I sign up again for another organization with the same email?). Moreover, I didn't understand how should one use this application within the 3 minutes I invested :)
You'll have to think of a way to prevent it from becoming a wasteland of "asdlkfjsakj" posts though.
Looks good!