How does the search service for mentions in social networks work?

Question

Programming

I have been looking for some kind of documentation or articles on the topic for a long time, but somehow even. In which direction to look and what to read, can anyone tell me so that you can write a keyword search service in social networks?
For example, like youscan.io or br-analytics.ru
Has anyone come across this?

Answer 1

and from specific Facebook and Vkontakte, for example? Stupid parsing? API? Some combination of both?

Only parsing, only hardcore. APIs do not give access to posts and correspondence, everything is handled, since there is no way to say that some kind of too complicated algorithm. Yes, there are nuances with authorization and accounts, spam traffic and other similar problems, but in general, the work of the crawler is quite trivial. Most likely, a part is dragged by ordinary queries from the curl, and a part is pulled out through a conditional webdriver, a la pupitir or selenium.

Answer 2

You just index everything on the social network and then search for the text as you like