Who says they aren't doing that?
2. There is no such chip with present technology. Smallest package is, reportedly, about the size of a pack of cigarettes. There are GPS transmitters that fit inside a cellphone (I have one) but not implantable - yet. A transponder (two-way) would be even bigger.
Oh - I forgot to point it out, but the posting of pages to the websites is done anonymously from cyber-cafes and the like all over the Middle East. That part is easy - you just did something similar to post this question!