MySpace is the most popular social networking website with 140 mln members, In-Stat says. 30% of survey respondents pay for premium services or features on social networking sites. Respondents who indicated no future plans to purchase premium services on social networking websites cited expense and lack of desired services and features as the main reasons for lack of purchase. Less than 13% of survey respondents use mobile social networking services. Furthermore, the overwhelming response was that the use of mobile devices for social networking simply was not of interest to them.