You know their name and address, sometimes even their location. The predator is always one step ahead of its prey. After the predator has raped/molested his victim, it is not uncommon for murder to accompany it. Philip Markoff would contact people on Craigslist asking to meet up for one thing or another. As innocent as he may seem, he is also known as the Craigslist Killer. It's easy to trust a nice guy or girl on the Internet, but who are they really? There's no way to know, but people do it every day. Human beings have become ignorant about the dangers of the world.