"Manning and WikiLeaks were credited as catalysts for the Arab Spring that began in December 2010, when waves of protesters rose up against rulers across the Middle East and North Africa after the leaked cables exposed government corruption" [1]
Mohamed Bouazizi's self-immolation was the catalyst for the Arab Spring. It's not as if Tunisians needed anyone to tell them how corrupt their government was. Once Tunisia looked like it might fall, revolutionaries in other countries started planning their own protests.
"One example highlighted by Shetty was Tunisia, where WikiLeaks revelations about Ben Ali's corrupt regime combined with rapidly-spreading news of the self-immolation of a disillusioned young man, Mohamed Bouazizi, to spark major protests." [1]
[1] http://www.guardian.co.uk/world/2011/may/13/amnesty-internat...
That said, you really need to learn the difference between proximal and ultimate causes.