This is the link I followed from Zvi over on Dreamwidth. As I understand it, there was an issue with posts that were initially posted as public and then switched to friends-only, but I don't know the precise nature of it. I think posts that were never public remained safe. I don't think entire posts could be viewed, only excerpts.

The search engine is called "Yandex." I've never heard of it; this is probably because I'm not Russian.