answer:I don’t see how anyone could give an accurate percentage on this with the vastness of the market. Apple computers are easy to compare and generate stats from because they’ve got such a relatively small range of products, from one company. Bring into the equation windows PCs with vast numbers of choices from many, many manufacturers and it gets difficult. Also, why does it need to be built in? I imagine there’s a lot of people out there with external webcams they’ve bought separately.