I disgree with the suggestion of using sites like Tinder, Plenty of Fish, etc. These are primarily 'hook-up' sites; people looking for action and less likely for a relationship. I place Craigslist and Kijiji in the same vein. It is really hard also to vet people out on such a site. I think you are better off with 'dating' sites like, eharmony, match, elite singles, etc. There are also several sites for people with disabilities including mental illness.

A word of advice, I would avoid the free ones. They tend to be people trying to just hook-up and are full of people trying to prey upon the emotionally vulnerable. It is actually a good idea to google phrases of what the other party sends you. It is amazing how many cons use the same words over and over. I found many fraudsters this way.

Other recommendations? Meet the individual in real life as soon as possible in the 'relationship'. Never lend money. Ask for other pictures (a fraudster usually only has one misappropriated profile picture). And never settle and concede.

Finally I personally had a very negative and positive experiences. I know of several others in the same boat.

Hope this all helps.