Buster Benson put together this concise way to think about cognitive biases by grouping them into four big problems our brains have evolved to deal with. There's a lot to think about (potentially systemically irrationally) here.
"I've always thought their status updates design was brilliant. Not because it was usable or attractive, I've always thought it was terrible. But because their design didn’t make promises they couldn’t keep." Painful and true advice: make sure you can deliver what you promise through design. [via rc3]
"To investigate more formally, I purchased some time on a computer cluster and downloaded a copy of the Wikipedia archives. I wrote a little program to go through each edit and count how much of it remained in the latest version..."