Cool Social Media Tools

Tweriod - Analyzes the times your Twitter followers are posting and recommends times for you to post.

Tweet Reach - Analyzes how many impressions your tweet or tweets received.

Reachli - Formerly Pinerly, shows how many clicks, likes, views. i.e. the value of each pin.   

Pinpuff - Calculates a pinfluence score.

Hootsuite - Scheduling for Twitter, Facebook and Google+

DoShare - Chrome extension that allows Google+ scheduling

Statigram - Analyzes Instagram data.

Who.Unfollwed.Me  Shows who's not following you, and who you're not following at Twitter