Twitter index: Obama celebrates his 50th birthday, Chris Brown and Justin Bieber song send Tweeps wild

(2011 Obama for America, All Rights Reserved)

“Happy Birthday Mr. President” tweet hundreds of Twitterers wishing American President Barack Obama a very happy 50th birthday for August 4.

Barack Obama’s campaign staff tweeted that well-wishers could send their birthday messages to the President via an online birthday card. “Today is President Obama's 50th birthday. Sign his birthday card and share why you're a part of this campaign: http://t.co/XHuP0SP” said a tweet on Barack Obama’s Twitter feed, @BarackObama.

Twitterers are excited to learn that American rapper Nicki Minaj will join the all-star cast of celebrities lending their voices to the fourth animated Ice Age movie, Ice Age 4: Continental Drift.

A new song by Chris Brown featuring Justin Bieber’s alter-ego “Shawty Mane” has sent Twitterers wild on the morning of August 5.

Bieber tweeted, “did a lil something on the upcoming @chrisbrown mixtape.. Ladies love me. then we got crazy on the @asherroth album. #shawtymane" before posting a link to the song, “ Ladies Love Me.”

Three new hashtags top Twitter’s most talked about topics while the American TV series “ Beyond Scared Straight” and “ Hell Date” appear in seventh and ninth places on the chart.

The top 10 most talked about topics on Twitter on August 5 at 7:30 AM GMT are:

1. #WhenIWas13 (new)
2. #thenihitthatdougie (new)
3. #weoffthat (new)
4. LADIES LOVE ME (new)
5. Ice Age 4 (new)
6. Happy Birthday Mr. President (new)
7. Beyond Scared Straight (new)
8. SHAWTY MANE (new)
9. Hell Date (-2)
10. Chris Brown's (new)