I just finished adding the new statistics feature to the tweet.ms URL shortening service.
Every link has a unique statistics URL that is shown after the short tweet.ms URL has been created and shows the number of visitors (both bots and humans are distinguished), the countries the visitors are coming from and a timeline showing the visits within the last days as a line chart.
Additionally pie charts are available for both browser names (Firefox, Internet Explorer and so on) and operating systems. A list of all the different referrers (100 maximum) is also included.
New cool features are coming soon. I have many new and exclusive features in store so stay tuned and most of all: use tweet.ms often in your tweets as your URL shortening service and support this free service.