I've never cited wikipedia as a resource. My university professors wouldn't accept it, I believe. Still, I frequently use wikipedia as kinda reference tool when I need to get some basic information on many things.
Debby, in fact it depends on the university or professor. I asked my daughter who is obtaining BA in the university about their rules in regard to Wikipedia citing. And she told me that they are actually not prohibited from citing Wikipedia as a resource. What is more, she told me that one professor used printed materials from Wikipedia in his lectures. Personally I don't think it's good for any professor to use Wikipedia materials in lectures. Professors have to appeal to respected sources.