My question about the origins of the berkeley socket API was quickly closed by moderators as 'off-topic'. It's a specific question about software engineering, so while I don't understand why that would be considered off-topic, can some one suggest a more suitable forum other than stack overflow? It's not immediately obvious to me that there is one.
Check the faq for what is on topic on Stack Overflow. Let's see how your question fits:
You don't have a programming problem.
No tool involved.
Again, you don't have a programming problem there.
So your question doesn't really fit on Stack Overflow.
There are a few open questions about the history of various computing terms/language features and such over at Programmers (I'm not active on that site, so take this advice with a grain of salt).
I don't have enough reputation to view your original post, but I suspect that you didn't really have a question about the practice of software engineering. Based on the word "origins," I think you had a question about history that happened to relate to software engineering.
There is currently no site on the SE network where such a question would be on-topic. (Side note: some people around here can get kind of prickly when you refer to SO or other SE sites as "forums.") If you were looking for a non-SE site to ask on, I don't know of one (and that would make your question off-topic for this site).
You could also try asking in chat, where the rules about being on-topic and constructive are much less strict. There probably isn't a room devoted to the topic of Berkeley sockets, but there are some pretty well-rounded people in the more active rooms who might just happen to know the answer you're looking for, or at least be able to point you in a good direction.
I would probably ask such a history question in a Unix/BSD/etc like mailing group or Usenet group. http://gmane.org/ is a great place to find mailing lists. Most are quite strict about on topic questions, but some, and some Usenet groups, are specifically dedicated to a broader range of discourse and people filter accordingly. They aren't a perfect substitute for Stack Overflow of course, but serve well in their niche.