Hamed, you are not the only one that can write Arabic, so be polite in your Messages "Toz Alykum" in Arabic = Up yours in English. Here we all share information and rest assured that there are many people from different countries, but they do not take advantage of others not speaking the language and posting such notes.
Ana Bathadnas Arabie Jeyid Jidan, Lakin Ma Bastiqul Al Fursa talama Akhroun Ma bithadasu Arabie = I speak fluently arabic, but do not take advantage of it since others do not.