Question 2 of 21

With 1.5 million followers as of 2010, this creature just might be the most famous animal on Twitter.

... Owner Jason Scott helps Sockington tweet his various kitty thoughts, and even sells a line of Sockington T-shirts.

Question 3 of 21

This young singer posted her first music video on Youtube in March 2011, and received more than 160 million views over the next month.

... Rebecca Black's "Friday" cost just $4,000 to produce, and propelled her to fame (or infamy) in early 2011, mostly because of negative reactions. The joke is on her critics, however. Black has appeared in a Katy Perry video and has fans that include Lady Gaga.

Question 4 of 21

In 2011, this social media site made news of its own because of postings made during a rare northeast Earthquake.

... Facebook had some rapid and fun postings, but Twitter ruled in getting the word -- and the comic relief -- out. News sites ran stories repeating top tweets from those who felt the earthquake. West Coast tweeters responded with tweets of their own, some mocking the quake's size and the public's reaction.

Question 5 of 21

This CBS TV series started as a casual Twitter feed by Justin Halpern in 2009.

... Halpern quickly gained more than 2 million followers before writing a book and launching the TV series "S**t My Dad Says."

Question 6 of 21

How many people watched Susan Boyle on YouTube in the first week after her audition aired?

... About 10 million people watched Susan Boyle audition for "Britain's Got Talent" on April 11, 2009, and the video quickly went viral, with 100 million views in the first week.

Question 7 of 21

Which Internet meme started off as "duckrolling" on the imageboard Web site 4chan?

... Rickrolling is a prank that involves tricking an Internet user into watching Rick Astley music videos.

Question 8 of 21

Who holds the record for most YouTube views as of summer 2011?

... Justin Bieber's "Baby" video has been viewed more than 500 million times on YouTube as of summer 2011.

Question 9 of 21

Despite its top-secret nature, a Twitter user inadvertently gave a live play-by-play of this 2011 news event.

... A Pakistani IT worker posted a series of tweets about noises and explosions as U.S. forces took down Osama bin Laden.

Question 10 of 21

This blogger gained fame after posting a video about her 300-page iPhone bill.

... Ezarik's video showed her leafing through the pages while listening to the iPhone advertisement tune. She now has more than a million Twitter followers.

Question 11 of 21

Which 1996 Internet meme went viral without the help of modern social networking sites?

... Awareness of the dancing baby video spread through the Web via e-mail, television news and word of mouth; it then was featured on an episode of Ally McBeal.

Question 12 of 21

Blogger Mario Lavandeira is better known by the pen name of:

... Lavandeira is better known by his pen name, Perez Hilton, a takeoff on Paris Hilton. He shares entertainment gossip with nearly 5 million readers a month.

Question 13 of 21

Heather Armstrong started this personal blog in 2001 and earned enough from ad revenue by 2005 to support her family by blogging.

... Armstrong also inspired the verb "dooce," which refers to losing one's job because of working on his or her Web site and blog.

Question 14 of 21

Lisa Lavie gained fame by posting music videos on YouTube, but is best known for this event.

... Lavie produced the "We Are the World" benefit video to raise funds for Haiti after the 2010 earthquake.

Question 15 of 21

Whose "Last Lecture" video garnered 3 million YouTube views between December 2007 and July 2008?

... Pausch drew inspiration for his "Last Lecture" from a terminal cancer diagnosis in 2007. The video was a tape of a lecture Pausch gave at Carnegie Mellon University, where he worked as a professor; it turned into millions of views and a book.

Question 16 of 21

Which blog was the first to publish the Monica Lewinsky story after Newsweek rejected it in 1998?

... The Lewinsky scandal -- first reported exclusively by Drudge -- led to a vote of impeachment for President Bill Clinton, but he was not removed from office.

Question 17 of 21

The "Prison Thriller" video went viral on YouTube after it was filmed in this country.

... "Prison Thriller" shows 1,500 Filipino prison inmates recreating the famous Michael Jackson "Thriller" video. They went on to produce videos of songs from the movie "Sister Act" and now give live performances at the prison.

Question 18 of 21

Which site allows users to combine short blogs with many of the features of Twitter, Facebook, YouTube and Twitter?

... Tumblr boasts an 85 percent retention rate, more than double that of other popular social media sites.

Question 19 of 21

Amber Lee Ettinger is better known by this nickname after starring in a 2007 YouTube hit.

... Obama Girl Ettinger starred in the music video "I Got a Crush On Obama," then went on to TV and modeling jobs.

Question 20 of 21

What a cappella group from Indiana University found fame through YouTube?

... Atlantic records signed Straight No Chaser to a five-album deal in 2007 after its chairman and CEO spotted them on YouTube as one of 8 million views.

Question 21 of 21

Judson Laipply stars in this third-most viewed video in YouTube history (as of summer 2011).

... Evolution of Dance garnered 70 million views in eight months, and many believe it helped launch YouTube into a wider public eye. It also didn't hurt the launch of Laipply's career as a comedian.

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