Twitter Grader

Twitter Grader was built to help people evaluate and improve their Twitter presence. It's a very user friendly tool from the guys at HubSpot and allows you to track your key stats including Rank, Followers, Following and Updates. As well as this, it gives you a grade out of 100 for your Twitter profile which attempts to quantify and measure its power, reach and authority.

(See how Twitter Rankings are calculated)

Nice extra touches are a Tweet Cloud, a trending graph for user history, and a handy tips and suggestions feature which will highlight any glaring omissions in your page.