I agree. It just seems that Natalee knew Joran rather well during the week she was there. Could they have possibly met before -- in person or online?
You know...I have watched so much and read so much that the mind is blurred as to where I saw or read it, but I do remember them talking about a chat room that Joran always went to.
Then again, she was young, he was good looking, and one of the smooth talkers that was use to getting his way. He learned how to "sound" sincere. Girls fall for that one big time.
Poor little thing, she believed him. (and he was one of those that was good at it. Heck, he probably had a couple of them going at the same time. )