I am an investor and General Manager of Maventus - we have developed MavSocial which is a complete social media visual content management and publishing platform for brands and agencies.
We have developed MavSocial keeping in mind some of the current challenges that social media marketers are having to deal with including
Access to consistent approved content
Publishing of rich media natively to social networks including direct (i.e. not via Youtube) publishing of videos to Facebook, Twitter, Tumblr etc
Obtaining visual content analytics