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POPULAR TOPICS BY THE MINUTE, DAY, AND WEEK 
- Justin BieberThe young Canadian R&B/pop singer has a lot of fans who like to tweet about him! U Smile, off My World 2.0, is now available on iTunes and he announced the first leg of his North American tour (March 16).
- PST 2010
- I'm IrishPeople are claiming their cred for Saint Patrick's Day, which while originally designated as a day for the patron Saint, is now more of a celebration of Irish culture (March 17).
- GuinnessMany people celebrate Saint Patrick's Day by drinking a pint of this beer (March 17).
- Nexus OneFrom the title of an @mashable article: Nexus One Sales Are Lackluster: Here's Why.
- #nowplayingPeople are tweeting their media choice of the moment.
- #whenifirstmetPeople are tweeting about something that happened on the occasion of making someone's acquaintance.
- #stpatricksdayMarch 17th is a day to celebrate Irish culture.
- #idoit2People are retweeting things they have in common.
- #RihannaRudeBoy
- U SmileThe Justin Beiber track off of his forthcoming second album will be available on iTunes tomorrow (March 15).
- Justin BieberThe young Canadian R&B/pop singer has a lot of fans who like to tweet about him! U Smile, off My World 2.0, is now available on iTunes and he announced the first leg of his North American tour (March 16).
- Tiger WoodsHe will make his return to golf starting with the Masters next month (March 16).
- Earthquake
- ChelseaThe team is playing Inter Milan in a Champions League soccer match (March 16).
- Rip The Runway
- Pico Rivera
- MastersThe golf tournament takes place April 8-11 and Tiger Woods has announced he will participate (March 16).
- Lady GagaHer music video for "Telephone" premiered March 11 and she announced tour dates today (March 15).
- I Love You
- SXSWSouth By Southwest is a music, film, and interactive conference and festival taking place in Austin, March 12-21.
- Magnitude 4
- Justin BieberThe young Canadian R&B/pop singer has a lot of fans who like to tweet about him! U Smile, off My World 2.0, is now available on iTunes and he announced the first leg of his North American tour (March 16).
- Happy Pi Day
- Lady GagaHer music video for "Telephone" premiered March 11 and she announced tour dates today (March 15).
- TelephoneLady Gaga released this new music video featuring Beyoncé.
- JemiThe fan nickname for celebrity couple Demi Lovato and Joe Jonas. They were recently confirmed as actually dating, so people are tweeting thoughts on the pair.
- Chuck NorrisChuck Norris doesn't turn 70, 70 turns Chuck Norris. His birthday is today (March 10).
- ChileThe country is experiencing further earthquakes, beginning with a 7.2 magnitude and continuing with aftershocks in the upper 6 range (March 11).
- Actor Corey HaimBest remembered for roles in The Lost Boys, Lucas, and License To Drive, the actor died this morning (March 10). He was 38.
- #nowplayingPeople are tweeting their media choice of the moment.
- #ffFollow Friday. People tweet suggested users to follow on Fridays.
- #thingscheaterssayPeople are tweeting things unfaithful partners might say.
- #imtiredofseeingPeople are tweeting things they'd rather not see anymore.