The story goes like this :
Instigated would not be the right word. The episode who started it ( the arrest of a bishop in the city of Timisoara) and then the spreading to the country capital was pretty spontaneous.
But here intervenes KGB. Armed interventions were already out of the question at that time, so they tried to steer the revolution in a positive direction for the Soviets.
Gorbachev plan was creating a new still socialist regime, only much open and democratic. That way , Romanians dissatisfaction would wither enough to keep them away from capitalism and western powers and remain on Moscow orbit.
That was pretty clear even in those time. Ion Iliescu ( Moscow`s man designated to replace Ceausescu) maintained a pro communism position in the first days, talking about bringing the famous "comunism cu fata umana" ( literally " communism with human face" or better translated , "a communism who doesnt kill and starve people" -> as it was seen at that time by a great part of Romanians.
But this plan was doomed to fail for 2 main reasons.
1) The West was quick to join the party
2) Romanians where never too fond of Russians ( obviously an euphemism
) so a pro-soviet orientation was impossible anyway.
So the "communism with human face" speech vanished pretty fast and Ion Iliescu became a full time supporter of capitalism , Euro integration and so on.