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Every user has access to a user page on which they can write about themselves. However, this should not be used indiscriminately, as user pages are intended primarily to allow editors to get to know one another better. Users are allowed to add content that is not directly related to the project, but please try to keep this to a minimum so as to prevent such content from using excessive server resources.
The wiki is not Photobucket or Imageshack, either. All uploaded images must serve a purpose that is useful to the project. This means that fake images are disallowed, and images in general that are not used in article space may be deleted at any time. If you upload an image to one of the aforementioned sites, however, you may display it in your user space by simply adding the URL to the wikitext.