In the Area 51 site proposal Agile Software Development four example questions are copied from elsewhere.
Three are copied from Area 51 site proposal Scrum and one from an external source (though it is now only in the Google cache and probably covered by "How to deal with questions or answers plagiarism from copyrighted sources?How to deal with questions or answers plagiarism from copyrighted sources?").
But what do you think about copying within Area 51? For example, is it acceptable with the right attribution?
Update: sometimes copies are downvoted (as "not a good example").