Recommendation services

Question

data mining

What interesting (and not so) recommendation services, social media analysis services, etc. do you know? Those. tools where data mining and its subsets text mining \ opinion mining are actively used. I would like to make a selection of links. Projects from Russia are especially interesting, but there will probably not be very many of them. As an example, I can give:

sentimetrix.com
last.fm
imhonet.ru
vkontakte.ru (music recommendation)
iqbuzz.ru

Answer 1

fs.ua

Answer 2

IQBuzz is not a recommendation, it's a social media monitoring service