Popsters - Analyze your social media pages and spy on your competitors
The Influencer Marketing Stack - Free resources to launch a killer campaign
Content Marketing Stack - A curated directory of content marketing resources
Top Instagram Influencers Ranking - Curated directory of Instagram bloggers by country&category
SocialRank - Graph search for TWTR. Filter by interests, location, etc
Insense & Paid Media - Find creators for short-term and long-term partnerships