The best way to "date" is to meet new people, form friendships and get to know them and not to look at each date as a potential marriage. I agree online is just another place to meet people. It's less frustrating to just take things as they are; some you may never talk to again, some you will stay friends with and eventually you will meet and get to know someone you will date once you know them and decide they are a person you can move further with. I don't think you know any more online than you do off what type of person you are dealing with. The only way to tell is to play it safe; talk a couple times, meet in groups or in daylight in public places. Any person who is worth their salt will understand, comply and have patience. The ones who are questionable will move on...so it's a screening process.
Can't we just meet different types of people and not put so many expectations on it? That would make dating much more fun - which is really what it's supposed to be. Not that being single is a bad thing...I wish people wouldn't put such a negative spin on it.