Quick Tip for Getting More RetweetsFriday, June 04, 2010
There are several free services you can use to shorten a link to make it fit on Twitter. Statistically though, Tweets that use tinyurl.com to save space are retweeted much less than tweets that use bit.ly or su.pr. Using the last two to shorten your links will increase the likelihood of being retweeted.
A bonus: both bit.ly and su.pr allow you to track clickthroughs, so you can measure how far your message is spreading.