Three little letters on Hillary Clinton's Twitter bio send the world into a will she/won't she frenzy over the 2016 presidential elections

Could 'TBD' be a signal that Hillary Clinton wants to get back in the presidential race?

Former US Secretary of State, Hillary Clinton (AP)

Hillary Clinton’s Twitter feed has caused ripples of curiosity around the globe after scrutiny of her Twitter bio increased suspicions the former first lady could run in the presidential election of 2016.

The former United States Secretary of State had already stoked rumours by telling a Toronto gathering how eager she is to see a female president in the White House.

Speaking at the Metro Toronto Convention Centre on Thursday for the Unique Lives and Experiences tour, Clinton told the 5,000 people present: “Let me say this, hypothetically speaking, I really do hope that we have a woman president in my lifetime.

“And whether it's next time or the next time after that, it really depends on women stepping up and subjecting themselves to the political process, which is very difficult.”

Although her approval ratings have reportedly dropped within the last couple of weeks, they remain above average and a poll conducted earlier in June by the Political Ticker CNN blog suggested nearly sixty per cent of Americans held a positive opinion of Clinton.

The instant she took to Twitter, the Twitter sphere seemed to take straight to her and she enjoyed a warm reception from fellow tweeters, particularly when she released a “selfie” snap of her with her daughter Chelsea. In just ten days she has already amassed more than half a million followers.

Her bio has attracted attention because of the ‘TBD’, or ‘to be decided’ at the end of a very long personal summary. Clinton describes herself as: “Wife, mom, lawyer, women & kids advocate, FLOAR, FLOTUS, US Senator, SecState, author, dog owner, hair icon, pantsuit aficionado, glass ceiling cracker, TBD...”

Clinton finished her term serving as Secretary of State in February 2013 and her reference to an undecided future has fuelled the already persistent rumours that she could enter the election race for a second time, after losing in the 2008 Democratic presidential elections.

Clinton has had an extremely active career and is the most travelled Secretary of State, visiting 112 countries during her four year tenure. She was one of those at the forefront of the U.S. response to the Arab Spring, including advocating the military intervention in Libya.