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What do Twitter users care about? Based on this week’s most-tweeted trends – pop stars, the environment, Easter, sports and Lady Gaga.

Our weekly roundup of the most talked-about Twitter topics delivers few surprises over the past 7 days … teen idol Justin Bieber leads the chart once again, while March Madness makes an appearance. Ricky Martin is new to the list, having made an announcement about his sexuality this week, and Earth Hour is also a newcomer in the past 7 days.

You can check past Twitter trends in our Top Twitter Topics section as well as read more about this past week’s trends on What The Trend.

Rank

Topic

Top Index This Week

Change

Description

#1

Justin Bieber

1

 

Justin Bieber fans and haters played an April Fools’ Joke on him by pretending they don’t know who he is. Fans of Justin Bieber also retaliated against the April Fool’s joke hashtag “#whosjustinbieber.” A Justin Bieber fan named April Phann passed away on March 29, 2010. Her birthday had just passed. Her only wish was to go to his concert. His new song, ‘Never Let You Go’ was released for download on iTunes.

#2

Follow Friday

1

 

#FF is a tag for Follow Friday, the meme where users list other Twitterers to follow.

#3

Earth Hour

1

NEW

On Saturday, March 27, people around the world turned off their lights for one hour, Earth Hour from 8:30-9:30 p.m. local time, to make a strong statement about energy use and climate change. Lights off!

#4

I ?

1

 

People are tweeting random stuff about things they love… hence (I ?)

#5

Easter

3

4

Both the Western Christian & Orthodox Easter are celebrated on April 4, 2010. The day is celebrated as both a religious holiday and a time to rejoice in bunnies, decorated eggs and chocolate.

#6

Lady Gaga

2

 

March 24 was singer Lady Gaga’s (Stefani Joanne Angelina Germanotta) birthday. She turned 24. Indonesian fans expressed their desire for a Lady Gaga concert in their country.

#7

March Madness

1

1

Every March the NCAA invites 65 collegiate basketball teams to play in an elimination tournament until there is only one team standing.

#8

Ricky Martin

2

NEW

Ricky Martin recognized his homosexuality in a blog post on March 29, 2010.

#9

Jonas Brothers

2

 

Fans are waiting for Jonas Brother tour dates and hoping that Chile is in their plans! Brazilians are tweeting love to the Jonas Brothers.

#10

Music Monday

3

 

Music Monday is a tradition where users recommend music they appreciate every Monday.

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Tags: Top Twitter Topics, trends, twitter