It can be credibly argued that the simmering discontent in Tunisia exploded in public anger when WikiLeaks published the cables on the U.S. ambassador's assessment of corruption by President Zine al-Abidine Ben Ali. The Tunisian uprising, then, was triggered by the WikiLeaks revelations, and fanned by the Internet.
It is highly improbable that the Tunisian uprisings were "triggered by the Wikileaks revelations" firstly because these leaks were hardly revelations for a public being ruled over by a corrupt dictator for over 24 years. That there was already a "simmering discontent" nullifies any possibility of Wikileaks being a cause for the uprising. Secondly, no country on the brink of revolt needs a Wikileaks to find out the right muhurat to end the lethal combination of poverty, unemployment and political repression affecting the masses for more than two decades. Wikileaks just happened to coincide very beautifully with discontent which was about to boil over anyway.