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There are no prizes for guessing the top Twitter trend this week, since a certain Canadian pop singer has appeared in the chart every week since this series began. Some new topics are worth noting, however: Earth Day got Twitter users talking, while the UK elections also set tongues wagging.

Below is the top 10 list, courtesy of our friends at What The Trend. Because this is a topical list, hashtag memes and games have been omitted from the chart.

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.

Top Twitter Trends This Week: 4/17 – 4/23

Rank

Topic

Top Index This Week

Change

Description

#1

Justin Bieber

2

-1

The young Canadian R&B/pop singer has a lot of fans who like to tweet about him! He recently came away empty-handed at the Canadian JUNO awards.

#2

Follow Friday

1

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

#3

Gender Roles

1

People, especially men, are tweeting about things that ladies should understand, and likewise, women tweeting about what men should do/say/prefer/be.

#4

Earth Day

1

April 22nd is Earth Day, a day to appreciate Earth and the environment.

#5

UK Parliament

1

Leaders of the UK’s three main political parties, Gordon Brown, David Cameron, and Nick Clegg, finished the Second Prime Ministerial debate, which took place in Bristol on the Sky News channel. The first one significantly increased Nick Clegg’s poll ratings.

#6

NBA

2

Among popular games played, the Cleveland Cavaliers lost one to the Chicago Bulls. The Los Angeles Lakers were victorious over the Oklahoma City Thunder. People commented on Ron Artest’s new haircut.

#7

Astrology

1

Tweets about interesting characteristics of the Zodiac signs.

#8

Super Junior

1

Lee Sungmin of Super Junior just created a Twitter account. Siwon, another member, recently had his Twitter account verified, and fans are welcoming both of them.

#9

Gang Starr

2

One of the greatest emcees of all time, Guru of Gang Starr has passed away after a battle with cancer on April 19, 2010.

#10

Twitter

1

People welcoming others to Twitter, discussing the 140 conference in New York City, a possible Twitter phishing attack, and an article by Mashable about using Twitter for business.

Image courtesy of iStockphoto, ricardoinfante

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Tags: top, trends, twitter