100 in 100 Challenge - Get 100 new paid users in 100 days
VerifyShare - instagram, instagram tools, giveaway, parsing,
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Giv - Snapchat & Instagram giveaways made easy
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.