I just found it interesting + awesome. I heard that at YC application, you provide your HN username. StackOverflow's Jobs listing is also based on the feature

I just found it interesting + awesome. I heard that at YC application, you provide your HN username. StackOverflow's Jobs listing is also based on the feature of observing the applicant's social activity in regards to the job in discussion. Saying, HR people are now definitely looking after your activity on the web, perhaps not all of them know where to look (e.g. looking at your facebook's profile, where there is a better source at quora/hn/stack-exchange/etc.)