Twitter is not just about sharing to the world in 140 characters about your thoughts. It's also about money, and not just for the founder but also members who have been cashing in on their Twitter accounts through humour or just because they are celebrities.

To mark the 7th year anniversary of the microblogging site which has over 200 million members, The Wall Street Journal listed the top five people who have earned megabucks just by tweeting.

1. Jack Dorsey, Twitter co-founder - His first tweet made on March 21, 2006 at 5:02 p.m. which read "just setting up my twttr." Since then, Twitter has attracted millions of users and by Forbes magazine's reckoning, had earned in just seven years what Alexander Graham Bell earned for investing the telephone. His business is now valued at $1.1 billion which translates into a $55 billion per character based on his landmark tweet.

2. Lady Gaga - She is neck-to-neck with other Hollywood celebrities in terms of Twitter followers. Hers is 35.3 million, just slightly lesser than Justin Bieber's 36.3 million, and a few million higher than Katy Perry's 33.9 million and Shakira's 20 million. John Bonini, content marketing manager for Impact Branding & Design, explained the large number of Lady Gaga's follower to her engaging her followers and even retweeting what they post. Forbes estimated that of the $52 million she earned from May 2011 to May 2012, one-third of about $17 million, came from her Twitter account.

3. Justin Halpern - Another Justin is lording it over Twitter, he is the author of the Twitter feed @s#*tmydadsays which he started on Aug 3, 2009. His first tweet which read, "I didn't live to be 73 years old so I could eat kale. Don't fix me your breakfast and pretend you're fixing mine," led to a book with the same title that was on the New York Times' bestseller list for 11 weeks.

It eventually was turned into a CBS TV series and earned for Mr Halpern more than $1 million.

4. TwitChange held in 2010 a charity auction for a nonprofit group to construct an orphanage in quake-ravaged Haiti. The group raised a total of $540,000 by having Twitter members' tweets followed and retweeted by celebrities, such as Desperate Housewives star Eva Longoria for a fee. The campaign not only raised that large amount of money and helped provide shelter for homeless Haitian kids, but also won the 2010 Mashable Award for the Most Creative Social Good Campaign.

5. Celebrity endorsers and retweets - As Lady Gaga and Eva Longoria had shown, being well known as its perks in terms of commanding a price to tweet something by as much as $20,000 for a single tweet. The Wall Street Journal cited the case of reality stars Kim and Khloe Kardashian who have parlayed their 17.5 million and 8 million Twitter followers into cash. In fact, the two controversial women have more Twitter followers than TV viewers, which according to Nielsen only reached 3.6 million for the 7th season finale of Keeping up with the Kardashians.

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