Chances are people you don't even know are being introduced to your journal every day, either randomly or through someone else. In addition to recent entries, people can get to know you better by what you posted in the past.
With that in mind, post a link to your entries on this day six months ago, nine months ago, a year ago, and two years ago.
Six months ago (April 20, 2005), I was complaining about the heat, starting a term paper over, and lawmakers in Texas being stupid. Oh, and I called a boy for a date.
Nine months ago (January 20, 2005), I was complaining about my roommate and her boyfriend fucking like rabid weasels, and describing my new professors.
One year ago (October 20, 2004), I was flipping out over the Red Sox winning the sixth game of the ALCS, and keeping a running commentary of the seventh.
Two years ago (October 20, 2003), I didn't post anything. I did on the 19th and 21st, though.