The Immortality Institute aka Longecity.org forum, is the most popular online community of Biohackers and tranhumanists. Their mission is to end the blight of involuntary death.
If you've ever wondered if there was a scientific community online where you can get your difficult questions answered and get respectful yet critical feedback on your Biohacking efforts I have good news for you... The Longecity community is precisely that! All the serious Biohackers hangout there discussing what they are doing and the latest performance and antiaging science, it really is one of my very best resources. If you see value in crowdsourcing you'll definitely want to join and be sure to connect with me on Longecity.org.