About twice a month, I look at the "Answers" section on LinkedIn. If I come across a question I think I am qualified to answer and if I have time, I answer it. Over the past 15 months or so, I have answered 18 questions, of which four were selected "best" and two more - "good".
Today, I noticed that LinkedIn actually lists five most prolific "answerers" of the week (it's called "This Week’s Top Experts"). Ready for this? The #1 expert this week answered 560 questions! In one week! The second best - 513! And he appears to have a full-time job!