Maker Swipe File - 100+ high-performing Tweets to help you grow your audience
Startup Stash - A curated directory of 400 resources & tools for startups
Narrow - Narrow helps you build a targeted audience and increase your influence on twitter.
Startup Buffer - Startup Buffer is a premium startup directory for emerging startups all around the world.
Tweetflick - Save, organize & find Tweets to get the most out of Twitter
Content Marketing Stack - A curated directory of content marketing resources