facebook is a social network in the internet. Thus, a network of friends who do not know well enough. Would cause stealth theft. Or passive movement of the various scams.
FaceBook is a social network extension in the Internet world. Therefore, there are additional unknown network friend is good enough to cause a hacking or theft of deceptive movement alias.
FaceBook to expand the social network in the world, so the Internet is a network add a friend does not know well enough to make the illicit traffic information theft or fraud of the movement of the lines.