Fun fact: original content (that's clearly identified as such) gets twice as many upvotes on Reddit in average than non-original content: http://i.imgur.com/3iudvZ8.png

Methodology behind the chart: http://www.reddit.com/r/dataisbeautiful/comments/2rv76z/oc_r...

The 10% rule is archaic, from a time where undisclosed self-promotion was rampant. Now that it's hitting false positives, it needs to be revamped.