If yes, then when was Stack Overflow proposed on Area51? And who proposed it? I think it is the most active site in the Stack Exchange network.
What is meta?
- Any Stack Exchange user can ask a question
- The community provides support, votes on ideas, and reports bugs
- Your voice helps shape the way Stack Exchange operates
Stack Overflow, Server Fault and Super User (collectively "The Trilogy") were the first three sites in the StackExchange Network and came before Area51. Once The Trilogy was successful (and after a brief foray into a paid SaaS model) we created Area 51 to democratically determine the subjects for the next Q&A sites to add to the network.
Stack Overflow is the most active site by far - see http://stackexchange.com/sites for detail:
So to answer your headline quetion - No.