Ah I'm so sorry folks, I just emailed a professor who's on the admission committee at Stanford, and learned that the offers have NOT been sent out! Apparently both the friend of mine and myself were spreading rumors too prematurely...really sorry for the confusion.
I'm now at Stanford doing a masters in regional studies, so I took a course with soc phds. She also told me there are another 10 people on the waiting list, so I guess there's still hope...
I don't think that's necessarily the case. It seems both of us who've been contacted by UW Madison got our bachelor degree from a foreign country. So I'm guessing maybe it's earlier for us simply because of administrative reasons about hard-copy transcripts or something like that...