Although virtual friends are awesome, there is one very distinct difference between virtual and reality- and it simply is that you don't know who that person is behind that ID. And as colorful and perfect as we want this life to be, it is very important to know the remember this fact.
At any given point in time, even the most trust-worthiest people on the forum could be lying to you - the key is to be careful when you come here and have fun, but don't let the virtual world become your reality, because it most certainly isn't.
The day that you start seeing no difference between your virtual friends and real friends is when you need to do a double take.