I'm looking at the big W-pedia, pages in a constant state of flux, vandals, updates. Not talking about the addition of UGC like comments, talking about the core content of a page changing a lot, sometimes in a manner that should effect seo adversely, changes that would effect a normal site adversely, yet the big W-pedia seems immune. Are their offsite factors so great that google really does not care about their on page factors?