It is a treacherous existence to be dating online. I have only joined one site and it is shameful to see the number of scammers, trans-chasers, and generally despicable characters on the site.
It is always good to be cautious. I am very leary of anyone wanting to move the chat off the dating site quickly (i.e. within the first few exchanges)… and anyone who claims to love me or want to be with me forever (we haven’t even TALKED and you want to marry me! WTF!).
A good practice that I have tried (and have yet to get burned so far) is a burner email rather than your phone number… you can easily create a gmail account and chat via Hangouts with it rather than give out your real phone number or email address.