The FSB is looking for people they can recruit, even here, on HackerNews, too. Look at the HN news history. You will find stories about Russian history or culture. In comments, some people are expressing their fascination with Russia or its culture. This is how FSB identifies potential sympathizers, who are easy to recruit. Most likely, some of those, who expressed their sympathy under such news articles a year or two ago, are already recruited by FSB.