Yandex and Facebook announced a partnership today that allows Yandex access to the full Facebook firehose data. This makes Yandex only the second search engine globally (along with Bing) access to this data.
Initially this data will be incorporate by Yandex into its blog search results pages. In the future Yandex is promising to add this data to more general search results so that public posts on Facebook along with the comments on those posts will appear. Along with featuring the data in search results Yandex is also intending to incorporate the data into its own search algorithms to improve the quality of its search results.
Techcrunch has a great summary article on the deal.