The most popular URL shortener is bit.ly. Most don't often think about the letters that come after the period at the end of a domain name, other than knowing that most sites end with ".com."
However, there's been renewed interest online in the fact that the ".ly" suffix is controlled Libya, a nation which has been, to say the least, controversial when it comes to relations with the West.
Another site that uses the .ly suffix? Republican Mitt Romney's Mitt.ly. The Politico's Ben Smith reports that this has led Romney's political action committee to change the domain for their site, though Mitt.ly is currently still in operation.
The new domain is scheduled to be Mi.tt, though it has yet to go live.
(via Ben Smith)