This answer (before it was deleted by the votes of six non-moderators) included the user's personal email address.
To me this seems to work against GIS SE because if the questioner decides to act on the advice privately then the site loses out on answering this question/getting the a right answer. Although this question (How to combine rows in attribute table using ArcGIS for Desktop?) already has several answers, should this kind of behaviour be discouraged, and should the email be removed?
I've had a look over the help topics but I couldn't find anything that mentioned not including email addresses in question/answers.