The Egyptian protest signs that are English are that way because some people really believe in Shakespeare's quote "The world is a stage, and all the citizens there on are the actors." (paraphrased:~)
Also it is easier for people in America and Europe to get angry if they know the language written on the signs, walls, etcetera.
To answer your question "who are they talking to" they are talking to everyone who will entertain them for a minute and hear them out prior to pushing a button on the next election and let the free world bomb the nonfree world.
Furthermore, the language is not Egyptian Arabic, it is Arabic. Eqyptian is an entirely seperate language, thus one may entertain the question: what happened to the true Egyptians? While you are figuring that out I highly recommend not entertaining the thoughts of anyone who subscribes to Sharia Law. (Please input your thoughts regarding Sharia Law here : http://andrewsavage.hubpages.com/question/199874/w... after you come to an understandment of what it is.
Thank you for asking such an intriguing question. Who are all of those people over there on air time, and do they have pertenance to over here?