As the social advertising markets grow to a projected $ 11 billion by 2017, mobile users are an important target.
78% of the face book users access via mobile at least once in a month and 60% of the Twitter users access mobile at least once in a month.
In many countries the individuals are using mobile phones as the primary access points for social network and they do share things twice as the PC users and they are most of the content shared by mobiles than the PC in recent times.
Because of these reasons they are the most targeted audience and all the major blogs and social networking sites are turning themselves compatible to the mobiles.