Better yet, get them on skype or some other network that allows direct contact, preferably with video. I want to tell you how do I see the situation about this site from my point of view.
Anyone sincere about a relationship should be willing to do this. The whole scammer game is to try to get you to think a person attractive to you loves you, and that if you loved them you would trust them. I am young enough, I knew this site from the friend of my mother and she recomended it as a site, where serious men are looking for serious relations (by the way, this lady came from London and is an example of honest and sincere woman).
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Men have to make the first move to get the girl they want, and the girls on FDating are not paid to correspond with you so if they are not interested, they won't respond.You have to go out and make the effort and the first move.