I spend a lot of time on here - it's an awesome community. Guaranteed to become a better traveler/person just be being on it - it's like a daily cleanse of good :)
I've been using Outbounding since it was in early beta and have been super impressed with how the platform has grown and attracted a thoughtful community. There is so much distinctly average travel content out there and their community are doing a great job of fixing the signal-to-noise problem and filtering out the good stuff! (eg. here: http://bit.ly/1oJwWIl)
GrowthHackers
Nervous System Quotient (NSQ)
Product Hunt