SocialRank Market Intelligence for Twitter - Enter any handle. Sort & filter their followers. Try @pmarca
Minter.io - Instagram Analytics. Twtitter Analytics. Facebook Analytics
ExactBuyer - Real-time B2B and B2C audiences & intelligence
Instagram Analytics by Socialinsider - Get better at Instagram marketing by studying competition
Precedent.io - SaaS content marketing, on autopilot
HypeAuditor - All-in-one Influencer Marketing Platform