I wonder how public this is? I've been thinking a lot about social networks recently, and what i want (as far as i can tell) is the ability to conversationally

I wonder how public this is? I've been thinking a lot about social networks recently, and what i want (as far as i can tell) is the ability to conversationally share with a group, but in an either private or ephemeral manner. The goal of ephemeral being, i don't like the permanency of the web. I want to join twitter, following tags and/or individuals i like, but i don't want anything i say to be locked in time. I'd like to build real relationships, with real people, and have it feel like real life. Where there is no record of everything[1]. I'm sick of everything being recorded in stone. [1]: Note that some record makes for a good UX. Logging onto FB to see what someone posted yesterday is nice. Beyond a relatively short timeframe though.. meh.