"The Arbitration Committee has ruled that '[t]he occasional light use of cross-posting to talk pages is part of Wikipedia's common practice. However, excessive cross-posting goes against current Wikipedia community norms. In a broader context, it is unwiki.' Wikipedia editors are therefore not to engage in aggressive cross-posting in order to influence votes, discussions, requests for adminship, requests for comment, etc."
"If there are a small handful of editors who share your taste and/or philosophy, it is sometimes acceptable to contact them with regard to a specific issue as long as it does not become disruptive. This is more acceptable if they have made an unsolicited request to be kept informed, and absolutely unacceptable if they have asked you to stop."