When you read these stories, you'll see that indeed, it is possible now to meet up with someone who isn't interested in you at all, but rather what you can do for them or what they can take from you. Too bad they're there - until we can find a means to stop them, the best we can do is protect ourselves. If you defend that train of thought - I'll expect to see your story here sooner or later. I will not argue that infatuation is possible, or that feelings of joy, contentment and overwhelming desire are possible. There, I've said it - it's out.
Same rules apply here.
When and if you hear those three little words that mean so much, step back. Step back hard and tell them you are doing just that. You will know when you meet in person if what you felt online is what you feel for them in person. Find out before you make emotional investments if they are the same in person as they were online. Be true to yourself, if you do not have the means to sustain a long distance relationship - don't pursue one.