Upvote:10
Facebook does not have a datacenter anywhere in CA. Their datacenter is in Oregon and another one elsewhere in USA (but I know for a fact that there is none in CA).
They also have one in Sweden.
In Silicon Valley they have servers but those are colocated at datacenters run by different companies.
Visiting a datacenter from outside is never a problem but inside a datacenter access is strictly monitored and not everyone can go there.
To be honest there is nothing to see inside, it's just boxes and cables and that's all.