Named Wonder, the application by Yandex is a social search app that acts as a recommendation tool for iOS devices allowing users to search and retrieve information from social networks such as Facebook. The app provided search results from Facebook in a more meaningful and discoverable way. For example it would let users see what all places their friends have visited; what music they have been listening to; and what have they been reading on the web.

The application was launched late on Thursday following which all API calls from the app were blocked by the social networking giant shortly. The exact reason wasn’t known at the time of the blockade but, it is believed that Facebook has categorically banned applications from including data obtained from the social network into search results until they have a written permission from Facebook.

The platform policy on Facebook reads, “You must not include data obtained from us in any search engine or directory without our written permission.” Facebook hasn’t confirmed if this is the reason for the ban but, Justin Osofsky, Director of Platform Partnerships and Operations over at the social networking site has provided the clarification after the much hyped ban.

Osofsky has assured that most app developers can go about their normal business but, the director adds that deviations in some apps have been observed that violate Facebook’s policies.

“For a much smaller number of apps that are using Facebook to either replicate our functionality or bootstrap their growth in a way that creates little value for people on Facebook, such as not providing users an easy way to share back to Facebook,” notes Osofsky in a blog post.

Beyond the clarification, Facebook has also gone ahead and tweaked clause 10 of its policy. The gist of the change is that Facebook will ban all those apps that use its data but, do not provide any means or make it easy for users to share back data with the social network.