You shouldn't trust people anywhere be it online or offline, if you haven't gotten to know them. A person can be just as deceiving offline as they are online. In fact, being with someone physically is even more dangerous if we are speaking in terms of deception. Someone on the internet has very limited control. A physical presence can be powerful, don't underestimate it. A kiss, a touch, all of it can be used to deceive and trap the heart. Such a devious person can even rip one from the grip of friends, deafening their lover to all outside advice. It would be extremely difficult for someone to get this kind of control from just conversation over the internet. To all those that lack experience, we are all still human, and yes even on the internet, our true personality and intentions will surface over time. It is safer in a lot of ways. While they have access to our feelings, they lack physical power. With offline dating, a person has access to both, thus making it more dangerous.