> The company's internal tools have a Facebook-inspired mechanism that Rossi uses to keep score. Facebook's developers all have a "karma" rating that is tracked through the code review system. Rossi can increase or decrease a developer's karma by clicking on thumbs-up and thumbs-down icons that appear next to the developer's name in a Web-based dashboard.
> The thumbs-up icon in Rossi's tool is the same one used for the "like" function on the social networking site. The thumbs-down image is the same icon, but upside down. When Rossi showed me the icons, he joked that he's the only person in the world who has a Facebook "dislike" button.
To me this was the most interesting part that whole piece. I've long thought Facebook could do with a "dislike" button for everyone. Keep it private, but let it affect what you see from whom, and how.