Eee, this is some kind of wild hole on VKontakte. In any chat, you click on “Attach,” and a pop-up window appears with a search through documents. Next, you can type the word passport, for example. It yields a bunch of links to various images. Of course, the uploaders themselves are oddballs – they uploaded their passports to some obscure groups or to their own pages. But to conduct a search through these uploaded documents is something else altogether. The same passport can be found using regular search, but it requires a very specific query – “Diana’s passport pdf”.
This relates to the issue that every convenient feature can backfire when there is too much broad and poorly controlled information in the system.
Hi, I'm Rauf Aliev. 