Twitter tracking Local Trends in Philadelphia, 14 other cities

Tracking the dominant conversations in Philadelphia’s Twitter communities has gotten quite a bit easier.
As the microblogging rock star announced on its company blog this week, in addition to tracking what phrases, words and hashtags are being most frequently used worldwide at a given time on Twitter, the trends can now be localized to 15 cities, including Philadelphia, or one of six countries.
This gives you the option to see while, yes, last night the top trending item in Philadelphia was stimulating conversation over the meme ‘I’m not the type to…,” the worldwide conversation trended more to “Best Sex songs.”

To choose a location to track, go to your Twitter account’s main page. Below the trending topics sidebar list, aside your follower stream, there should be an option to change from the worldwide default.
The other 12 U.S. cities are Atlanta, Baltimore, Boston, Chicago, Dallas, Houston, Los Angeles, New York, San Antonio, San Francisco, Seattle and D.C., in addition to London and Sao Paulo. The country choices, in addition to the United States, are Brazil, Canada, Ireland, Mexico and the United Kingdom. More choices are expected.
As Mashable recently reported, of course, while an interesting feature, there is no mistake that in order to see local trending, you have to specify a location. Twitter wants to know where you are or identify for a host of reasons, all of which involve the localizing of the Web.