Personally I think that "X is an American site" is over-used and doesn't actually make all that much sense when applied to things that cover general world-spanning issues.
I wrote a stupid message first that the person above you replied to accurately, I changed my stupid message to be less stupid while still reflecting my opinion on the matter.
What relevance does that have to the question, may I ask. Do you think, for example, that every user of Twitter is American because Twitter is an American company?!
But that's my opinion.