Two way screens are a symbol of the party always watching and monitoring its people. They also symbolize the tendency of totalitarian governments to abuse technology to further their own ends instead of to improve living standards.
3. The television in Mali is available only to those that can afford it. The programs and movies are transmitted in french, since the country is still a little colonized. I believe another reason is that it is the main language of Mali, and those that cannot speak French are those too poor to afford a television.