Where and How to search on the walls of users in Vkontakte and Facebook by keywords?

Question

In contact with

Question, Yandex, froze the search on the walls of users in contact. That is, they still have a blog search, but the ru zone is set by default and cannot be changed.
2 social networks Contact and Facebook, provide interest. Users post ads on their walls, I'm wondering who can do a search.
Example: I am interested in renting apartments. I used to search in contact, through a blog search. Now this is not possible. (Only user walls are of interest, not communities, groups, companies). This topic is relevant in many areas. Monetization can be done without problems. I myself am ready to pay some money (not immediately, but in installments, based on the results of the work).

Answer 1

there is a news search https://vk.com/search?c%5Bq%5D=%D0%B0%D1%80%D0%B5%...
this search has api https://vk.com/ dev/newsfeed.search?params[q]=%D0%B...
yes. this search returns all records. and which are on the walls of people and which are in groups. but they can be filtered later.