The French Revolution was a bourgeois revolution, yes, but sections of it were definately Socialists and some were even Communists (non-Marxist though), most notably Babeuf, who has already been mentioned. In addition, the 1793 constitution that was never brought into force is a fairly good constitution in my opinion and could easily be used, with some modifications of course.
In addition the French Revolution siginals the start of modern socialism. Yes, there had been Communists and communist ideas prior to the French Revolution (The Diggers, for instance) but only after the French Revolution can you trace a constant evolution in theory, practice and so on.
As fr Rousseau, he died long before the beginning of the French Revolution, although the Social Contract did become almost the 'handbook' of many French Revolutionaries, particularly the Jacobins. However it was bastardised and many of the key ideas put forward in the Social Contract were ignored.
The Great Terror has to be mentioned. I find it hard not to defend it. Was it extreme? Yes. But revolutions are not peaceful or calm things. I cannot shed tears about the deaths of the French Aristocracy.
"In reality, the difference is, that the savage lives within himself while social man lives outside himself and can only live in the opinion of others, so that he seems to receive the feeling of his own existence only from the judgement of others concerning him."- Jean-Jacques Rousseau
"The emancipation of the working class must be the work of the workers themselves.”- Flora Tristan
"Both those on the East and those on the West should be clear with the fact that we are not moving away from our road that we beat the path for in '48. That is to say, that we have our own ways. We always bravely say what is right on this side and what is not, and what is right on the other side, and what is not. It should be clear to everyone that we cannot be an appendage to anybody's politics, that we have our own point of view and that we know the worth of what is right, and what is not right."- Josip Tito