What are common characteristics of top content marketing agencies?

1. They will have their own blog, Facebook fan page, Scribe, Twitter accounts
wherein they promote their own content .
2. They are willing to educate you, even if you're not ready to sign up with them.
3. They have achieved some solid results for their clients.

Mintent is a content marketing platform built for content marketers and communication professionals. It is an end-to end platform that helps content marketing teams define strategy, plan content production, and measure results.
http://www.getmintent.com/