I started offering hosted guestbooks as a Perl CGI script, backed by a homegrown pipe-delimited text file database, in the 1990s. I moved them over to PHP and MySQL in 2002. 11,000 of those guestbooks are still linked from live websites, and about 600 have had people add new entries in the past year. I added reCAPTCHA a few years ago to keep the spam to a minimum, otherwise they look essentially the same as they did in the 1990s, with a variety of neon fonts on custom tiled background images. I plan to keep hosting them forever.
