Wikipedia:Guestbooks

Users can easily create a guestbook at User:(Your name)/Guestbook. You can ask other users to sign it by placing a link to it in your user page.

Other users can sign the guestbook by putting the sharp character (#) and their username, followed by their name and a message. You may also use the sharp character and sign four tildes (~~~~). This will show your signature and the timestamp.

1. Example -- Hi!(~~~~)
2. Example 2 -- Glad to sign this guestbook!(~~~~)

• Do not beg others to sign your guestbook. Users eventually will come to see your user page, and many will click your guestbook and sign it without being asked.
• Don't ask a user to sign your guestbook by posting that message on a talk page.
• Be patient. Users will eventually come. After all, you should not be here only to see who signed your guestbook...
• Don't give barnstars out just for signing a guestbook. It devalues the barnstar process.

Let's say that this was a fellow user's guestbook.

1. Good Example -- Hi!
2. Good Example 2 -- You're great! Thanks!
3. Good Example 3 -- +1 to you!

1. Bad Example -- Please sign my guestbook!
2. Bad Example 2 -- Since I signed your guestbook... PLS sign mine!
3. Bad Example 3 -- This is fun! I also have a guestbook. Please sign it!

• Only sign using your name. Messages of support and encouragement are encouraged, but ultimately it is up to you!
• Generally don't post any pictures with your message -- this is a guestbook, not a scrapbook.
• Like the examples above, don't ask other users to sign your guestbook via another user's guestbook.
• You are here to build an encyclopedia: Do not spend your time only signing guestbooks. It may be fun, but users may see you as someone using Wikipedia as a social media platform than an encyclopedia.
• Guestbooks are not a soapbox.

-- And you'll be all set!  

You can also try a Guestbook search.