I am not sure Wikipedia is a social network, in the sense that most users aren't there to have discussions or earn followers or do other typical social network things. Also, Wikipedia is very much moderated.

Wikipedia is unlike the original Wikiwiki Web (https://wiki.c2.com/) which had discussion threads on the same page as articles, and feels more like a social network. On this page:

https://wiki.c2.com/?WhyWikiWorks

it explains that things work because it's easy to roll back to the previous version, a feature that is shared by Wikipedia.