 One way of limiting the temptation of users to share is requiring default privacy settings to be strict. Even then, this limits access for other users (“friends of friends”), but it does not limit access for the service provider. Also, such restrictions limit the value and usability of the social network sites themselves, and may reduce positive effects of such services. A particular example of privacy-friendly defaults is the opt-in as opposed to the opt-out approach. When the user has to take an explicit action to share data or to subscribe to a service or mailing list, the resulting effects may be more acceptable to the user. However, much still depends on how the choice is framed (Bellman, Johnson, &amp; Lohse 2001).