she probably doesn't know anything about the differences between them
I think she knows the differences between them considering that she's being paid by Msft to promote the product. They surely must have enlightened her on the 'benefits' of using a Surface tablet compared to an iPad.
"As beings of finite lifespan, our contributions to the sum of human knowledge is one of the greatest endeavors we can undertake and one of the defining characteristics of humanity itself"
Her agent will have made a quick phone call to tell her there is $50K in it for her to say something nice about the Surface, so she just got one of her people to tweetedwhat Microsoft wrote and banked the fifty grand.
If you get an email telling you that you can catch Swine Flu from tinned pork then just delete it. It's Spam.