yours is not a lone case of such mischiefs.
i have came across such cases with me and many friends who gets actively involved in many social forums like this.
in some cases,they contact you in your email ids even (how do they get this?)
once you reply to them via mail,it is a confirmation that such person exists.
in some cases,you will get a mail stating that "I am a young girl of 19 or so, and staying at an orphanage, and need our help in handling millions or some times crores of her inheritance etc"
you may even get a very exciting photos of them.
all these are part of an international crime syndicate and nothing to do with love.
It is better not to respond to any such message and get into their trap.