Ask HN: Ideas for first implementation for encryption algorithm

I have designed what I think is a pretty clever algorithm to encrypt web communications. It basically allows two or more people to communicate through a browser without any plaintext data leaving their local machines. My servers only hold ciphertext. I think this can be used in a number of implementations; but I have to start somewhere, so I would like to know what the HN community would like to see and use. My ideas: -Encrypted Twitter-like app -Encrypted social network -Encrypted web-chat -Encrypted email -Anything else?

I think it is advantages to be able to be able to charge for the first implementation, so things like an encrypted social network may be a bad idea (even though I think there is probably a market for it).

Thanks for all the feedback!