Well the reasons, while sad, are not that hard to understand. Being in a chat room and not getting any chats is a very lonely experience. So one ploy posers use is to meet you perhaps as the same gender as you are, become friends and learn what you like and dislike in a lover and then build a profile to give you just that thing. So what you need are ways to sort out if the person you are chatting with is genuine or a fake.
In online dating, we meet a lot of people through the tools of instant messaging, email, and chat rooms. If a guy cannot get a conversation with a girl, he might pose as a girl just for the conversation. If you find a fake, you can decide what to do about it. Or you can try to help them come clean with you so you can build a real relationship with them.
But putting up a fake profile to others in chat settings is epidemic online. They use the fake ID to replace what a good personality and ability to be real would get them otherwise. Or you can even go as far as reporting them so they will be punished by the service.
So you need some tips on how to spot what they call a poser online. My advice is politely bid them farewell and move on to greener pastures.
It is a strange phenomenon but you meet someone in chat and they start to open up to you. Do they try not to tell you very much about their past?
If your friend does not offer those generously, it might be because there is no past to the character he or she is playing. If you are dealing with a poser who is not being their real gender, they probably do not understand the gender they are trying to portray.
You have talked to a real girl and a genuine man; they will express themselves easily and appropriately.
Do they avoid voice contact, have few pictures or keep stalling on making contact via webcam?
Then obviously they are not who they have presented to you. It is a sad thing to report but posers steal pictures to complete their persona.
Keep some notes on your talks, particularly about their personal details and history.