Social norms are the behaviors and cues within a society or group. This sociological term has been defined as "the rules that a group uses for appropriate and inappropriate values, beliefs, attitudes and behaviors. The social norms indicate the established and approved ways of doing things, of dress, of speech and of appearance.
The definition of social norm is stated in wikipedia like this.I think the contraction or the change of these social norms are profondly affected by television programmes. For instance the way we dress is highly affected by fashion programmes. There is a sharp transition in clothing style of young generation. Another example can be the fact that more and more people started to use foreign words mostly English in their daily life. In my opinion one of the most influential factor on this speech degeneration is Turkish evening serials. In most of these programmes the actors and actresses make use of lots of English words because of than these words easily take place in peoples daily life.
Considering the effectiveness of TV programmes on the shaping of social norms.I believe that TV programmers should pay attention for these issues but I do not see this attention in these programmes.