Is it possible to build the next killer startup using some kind of pin number or pass phrase authentication without the use of personal information, or minimal personal information.<p>I just went over to foursquare to check it out and they want all kinds of personal information to log in. This is the same as any other social networking site as expected but such a disappointment.
I've considered this problem, even built a product to address it. A difficulty is that if its anonymous users won't know who there friends are and if you add a pin exchange system you are creating excessive difficulty to your friending system.<p>If you figure out a way to get around not knowing who other people are on the network while still being able to find your friends then you will be one step closer, but you will also have to figure out a system that is simple enough to be comparable to the easy of adding friends on Facebook.<p>After solving those problems, good luck getting over the network affect of Facebook's already established network.<p>Personally I think you need to look forward instead of backward, Facebook and Google products already exist and have an established user base, the next big thing on the internet isn't going to be a remake of what already exists, it will be something NEW.
Umm... most sites offer the ability to login using an username and password. I don't see what mainstream problem you're trying to solve here.. most people dun care about stuff like this