This might sound off-topic; but I had to ask here first before starting on-wiki discussion in order to create a new official policy on the Arabic wikipedia. also because the user who is the reason for this requested no farther conversation with him/her until she/he gets a word from the foundation about it.
Simply, the issue is a case of advertising using a username, as you all probably have seen it before.
More detailed: a user of ours in ar.wp have choosen to contribute to the Arabic wikipedia and a three another wikimedia wikis(as s(he) mentions in my talk page) under the name of صوت للبتراء, as you can see; this name is translated as "Vote for Petraa", you can see here the imperative form in 'Vote' and the advocacy/propaganda of saying Vote for Petraa..for those of you who might haven't heard; there is currently a project/event called the new 7 wonders of the world[1], the Petraa is one of the nominees in this event[2]..I have nothing againest new 7 wonders or what so ever.. but I wondered, "Wikipedia isn't for these kind of things" and "the users should not use such nicknames or it will be a good tool for advertising whatever they need" and "Wikipedia isn't a front to tell people to vote for something" and "it is annoying each time I take a look at that nickname with its imperative nature" and such thoughts etc.
I asked the user to simply ask one of our local fellows to change the name to something else without the ad-sense in it, but s(he) simply told me that I will have to bring something from the 'foundation' that agrees to my suggestion.
So, I'm simply asking; is such usernames to be tolerated? and if it isn't, can you please write something from the 'foundation' as "User:Vote for Petraa" or "صوت للبتراء" says to say that? and if it is really tolerated(it would seem strange though), would a consensus on ar.wp of the active editors be sufficient to activate a policy so that users will use non-advertising titles etc. in their nicknames/usernames.
At last, sorry for the long message.
Mohamed Magdy~alnokta