[jdee]

I'm interested in learning how people go about testing ideas that are difficult to define in the small amount of screen real estate that an ad offers, or dont have a clearly definable customer type.

How would one go about testing the waters for 'mass market' applications like Twitter, Google+ etc where the end customer is potentially everybody? I cant see how an ad like 'want to keep in touch with your friends?' would convert at all. Any insight anyone?