Editing others' posts
Fragment of a discussion from Talk:LiquidThreads
Tonyk: there's not a way to stop other people who are logged to edit your posts or pages you edit/create, but your best defense is to add pages that you post to or edit to your Watchlist (see: Wikieducator_tutorial/Communication_and_Interaction/Useful_features and turn on the email option on your User preferences. This way you will get an email whenever a page or post you have created is edited and you can see the history of edits to see what was edited.
BrentSimpson (talk)