Yes, I think one sure can. But you also need to take precautions. Do not give out your phone number or full name to anyone you "meet" online. If you meet someone make sure it is in a very public place, and for heavens sake do not get into the car of someone you have just met.
I have used several online dating sites over the years. I did meet someone I cared about very much and we lived together for several years. I have met many people who found their spouse by online dating.