100 in 100 Challenge - Get 100 new paid users in 100 days
GrowthList - A crowd-sourced list of growth hacks
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
#buildinpublic - Discover what people are building in public
Growth Hack World - Together We Rise
FIRST - Post a date, pick a winner & meet up.