Wikipedia:Tip of the day/June 28, 2006
Signing your posts prevents readers from getting your messages confused with those by other users. Therefore, it is considered proper "Wikiquette" (WI-kee-ket) to sign your messages on talk pages. To do this, add four tildes (~~~~) to the end of your message. When you save the page, these will be converted to your signature and a date stamp. To sign without a date stamp, use three tildes (~~~) instead. The default signature for your account is your username, but you can customize it in your preferences menu.
Read more: Wikipedia:Sign your posts on talk pages