Talk Page is your own, however, public inbox where users can leave you a message with regards of something, be it about the wiki or personal matters. Talk Pages are automatically given on users along with your own User Page. But there are rules one must abide with regards on their talk page.
Deleting of Talk Page Messages: Be it old or new, deleting of talk page messages wont be tolerated. Talk Pages should be open for everyone, and therefore the messages in it should be visible. This rule can only be broken if you receive a message that is rather offensive, threatening or insulting.
If such case happens, the offender will receive a guaranteed block, but the duration depends on the severity of the message.
Altering of Talk Page Messages: Altering Messages will be allowed, given if there would be additions or minimal revisions. However, changing the whole content of the message wont be allowed.
Archiving: This can be done once the messages gets too large, that scrolling through your Talk Page becomes really difficult and if you're having the urge of cleaning, but not removing, your old messages. However, when archiving, be sure that all the messages are answered and solved, if ever there's an existing issue.
Article Talk Pages: If something needs to be discussed in an article, do so in the article talk page. General topics should be put up in either the blog or forum.