Cleaning out the closet

I have been cleaning out my belongings from the basement and have found some treasures including my 2nd grade invention, a 'reading machean':

"My second invention would be a reading machean (the first one was a 'time mashing').  It would read to me out loud and tell me the questions to reading"

I also found a letter I wrote to USACityLink.com (for a class, I assume).  USA CityLink was described by 'Virtual Reference Desk' in 1997 in this way: "The USA CityLink Project is the most comprehensive United States city and state listing on the web, as well as one of the most visited sites on the Internet today. It provides users with a starting point when accessing information about US states and cities."

To summarize, I told them in hand-written detail, "for the most part, your page is pretty good," but I had some words of advice, too:  (1.) "You should try to get this page on to as many search engines as possible." (2.) "You should include sports, lakes, and more fun things to do (in Reedsburg), and (3.) "Also, what good is a chat room with no people? I went there and was the only one there. You should try to publicise this chat room or hire someone to stay in it to answer peoples' questions."

Well, it appears they haven't changed the site much since I wrote those recommendations.  Their listing for Reedsburg still does not include sports, lakes, or more fun things to do in Reedsburg.

These two papers I don't mind putting on the internet now, but there were also plenty of middle- and high-school writings that I would not want published on the web.  My question is how can kids and teenagers publish their papers, tweets, or blogs online without being embarrassed by what they wrote 15 years later?