Today I came across the Reddit forum for Bipolar Disorder. I'm not currently a member of Reddit, but recently I've enjoyed browsing and was surprised to find the Bipolar subtopic. It looks like an ideal place to get support.
By the way, if you are ever in a bad mood and need something to distract yourself for awhile, try browsing the Reddit homepage, or maybe the funny category. It helps me stay distracted when I'm in one of those blah moods.