| 2026-08-20 | Forum discussion, popular once |
| 2022-10-30 | Early online forum |
| 2022-06-19 | Early online discussion forum |
| 2021-11-21 | Early online forum that popularized terms like "FAQ" and "spam" |
| 2018-10-22 | Online discussion forum |
| 2018-06-10 | Early online forum |
| 2016-07-31 | Early online forum |
| 2015-06-14 | Early online forum |
| 2014-09-27 | Early online forum |
| 2013-01-02 | Newsgroup system since 1980 |
| 2012-06-23 | Setting for many early online discussions |
| 2011-11-27 | Early online forum |
| 2011-04-27 | Online newsgroup system |
| 2011-02-13 | Early online forum |
| 2010-12-20 | Early computer forum |
| 2010-08-13 | One of its groups is rec.puzzles |
| 2010-05-29 | Web forums' ancestor |
| 2009-10-16 | Early online discussion setting |
| 2009-05-01 | Predecessor of Web forums |
| 2005-06-19 | Online newsgroup system |
| 2005-02-09 | Online newsgroup system |
| 2004-04-05 | Large system of newsgroups |
| 2003-11-01 | Online newsgroup system |
| 2002-11-24 | Online newsgroup system |
| 1999-07-15 | Electronic newsgroup system |