Chrome: TIL and other subreddits are a great resource for interesting facts. A new Chrome extension called Mostly Harmless can let you tap that knowledge to find out the best parts of any web page.
Mostly Harmless looks up the page you are currently viewing to see if it has been submitted to Reddit. If so, you can see everywhere it has been posted.
Redditor OtterVonnBismarck used this to learn a few quick nuggets of information from any Wikipedia article. When you're browsing Wikipedia you can see all of the TIL's that people found interesting about that particular article, which is a fast way to get some interesting tidbits about a subject.
Of course, it's not restricted only to Wikipedia. We tried it on some of Lifehacker's most popular posts as well as several other websites, including Quora, Mental Floss and found that it actually works well in many cases, although not all.
In a nutshell, it's like a TL;DR for finding out the best bits of any page according to Reddit. Try your luck; you might just learn something cool which you would have otherwise missed.