Facebook friend pruning. Your present friend count is your starting point, from which you trim the ranks until you are at roughly 30% of the original count. You have one hour for the initial pruning.
After the initial friendship holocaust (mass deletion session), bonsai theory applies. You must never be content with your network - allow it to grow, while at the same time trimming it back to maintain balance. Feel free to re-add friends as they re-enter your life. Your goals are minimalism and overall quality.
"I started practicing bonsai Facebook about 3 months ago, going from 337 to 78. The steady-state appears to be around 85, and my friends are top-notch."