Who knows? A small list could include current or potential employers, advertisers/profilers, law enforcement, stalkers, and anyone else who could possibly be interested in your for the rest of your life. Perhaps a poster will want to run for public office in 30 years, only to have something they wrote come back to haunt them. Just look at what happens during congressional vetting of presidential appointees now, and imagine how bad it will be when these people come from a generation where much of their correspondence is available through either public research or rubber-stamped warrants...