From Kaspersky blog on Short URLs in Twitter:
As we discussed not so long ago, short URL services are becoming more and more popular among social networks. And the recent event when such a service got compromised highlighted the sensitivity of the problem.
We decided to take a look at just how popular each of these URL shortening services are on Twitter. So we’ve collected all the URLs from the public timeline and thought it would be nice to share the results with the world. The stats are based on data collected during a 24 hour period.
I still don’t like Twitter. I still think it’s not for everyone. Be careful out there or stay away if you really don’t need it.