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A user page is a page about a wiki user with an account on the wiki, and who is (most probably) a contributor.
If you have registered, your user account has been created but you still have neither user page nor talk page. Then you can create your own user page. Your user page is linked in the top right. More importantly, others will see links to your user page from various places which assist wiki collaboration. This includes the "Recent changes" and "page history" displays (See Help:Tracking changes). You can also link to your user page within text of a wiki page, which is mainly useful on talk pages when you sign your name.
If you have not registered, you are identified by your own IP address. But at this stage no user page nor talk page will exist. The talk page of this IP user creates automatically when the first article is added to it. You can then create the user page of the IP address.
What to put on your user page
User pages are just as flexible as any other wiki page, and it's a page all about you, so generally people will leave you to freely write your user page in whatever format you like. It's a feature to help other people know who you are, and to bring the online community closer together. Think of it as a “profile” page. You might like to mention where you are from and what your job is. You can also state what your main areas of interest are in relation to the topic of the wiki, and describe contributions you have made or areas where you are interested in contributing.
User scratchpad / development area
You can use your user page as a scratchpad. An area for developing ideas without cluttering the main namespace (see Help:Namespaces). If subpages are enabled (see Help:Subpages), you may find them useful for creating subpages under your user page. However, you should avoid expending too much effort within your own area of the wiki. Be bold! Edit the main wiki articles! If your wiki has a shared Sandbox page, you can also use it for quick (non-permanent) wiki experimentation.
Other people's user pages
As mentioned above, you will see links to other people's user pages, in various places throughout the wiki.
When viewing another person's user page, an additional link "user contributions" appears in the "tools" of the sidebar. This takes you to a list of all of this user's wiki edits. Use this to get an idea of how prolific a contributor somebody is, or to track down edits made by a user who is causing trouble/making bad wiki edits.
Editing someone else's page
It's generally considered bad etiquette to rewrite or reword another person's user page. You should not change content on someone else’s user page without their permission. Editing is not disallowed, but you should avoid adding information (or especially opinions) which might be misinterpreted as coming from that user, in situations where this could potentially cause upset. Some types of edit are widely acceptable, and unlikely to cause upset:
- Fixing internal links, when a page has been moved or deleted
- Fixing broken external links
- Categorizing or fixing categories of user pages.
User talk pages
Every user page has an associated talk page; a "user talk page". This is a special kind of talk page, for leaving messages directed at a particular user. See Help:Talk pages#User talk pages.