In 2006, Game Day was relatively easy to organize. There were three games, 60 people, and six teams represented by colors. The day included round robin Bocce Ball and Kickball competitions. It concluded with a relay race involving all the teams, which ended in a human six-person pyramid. Everyone was slightly pink the day afterwards.

By Game Day 2007, the number of participants had doubled, which presented a challenge. Like so many engineering challenges at Facebook, Game Day itself had become a scalability problem. In order to accommodate everyone, we added two more teams to the team roster. Teams got creative that year and gave themselves names based on their colors: Orange Crush, Purple Haze, and Gang Green were among some favorites. A single-elimination tug-of-war tournament was added as a main event to spice things up a little. The end relay race was elongated, but still ended in a human pyramid. The day after, everyone was slightly pink, but mostly sore. Many blamed their soreness on the addition of Capture the Flag.

By Game Day 2008, the number of people playing had more than tripled in size since the previous year and we were looking to host nearly 400 attendees. As scalability challenges go, this one would be a doozy. No longer would the organizers (myself and 6 others) be able to partake in Game Day games; each of us would need to act as a full-time Game Day referee. To deal with the massive increase in players, we added two new team colors, increasing the total number of teams to ten. New teams and new names formed: Blue Steel, Redrum, and Purple Reign were among some creative favorites. Five 80-person games at a time would be a little excessive, so each team would be strategically split into playing two games each round. We added six new games to the roster, including a parking lot relay featuring separate Green Machineâ„¢ and Ripstikâ„¢ courses. In order to avoid rampant post-Game Day soreness issues, we also required each team to do a bit of team stretching before the day began. Like the previous year, the day concluded with a tug-of-war tournament and a relay race that ended in a six-person human pyramid. The day after Game Day, everyone was still sore and slightly pink.

People You May Know looks at, among other things, your current friend list and their friends, your education info and your work info. If you are already friends on Facebook with some people from your last job, for example, you may find some more of your former coworkers (assuming they are visible to you in search) among the "People You May Know' suggestions.

You'll see People You May Know on the Find Friends page and even as News Feed stories. The Home page box will only appear with what People You May Know considers to be its very best suggestions. We hope that most of these suggestions are people you want to be friends with, but we know that might not always be the case. To solve for any mistakes, you can remove someone from the People You May Know list by clicking the little "x" icon next to the name. The person you "x" won't be notified and that feedback will be used to improve the quality of the future suggestions. In addition, you will not appear as a suggestion for the person that you "x" out.

We introduced this feature somewhat recently with the specific intention of helping the newest people on Facebook find their friends quickly. Since then, we've constantly been making changes to the tool. We started showing it to everyone, not just new users, and we changed the rules so that it only shows on the home page when the suggestions are strong enough. If you "x" all of the suggestions we have, eventually the box will disappear. We will continue to make changes based on the feedback we hear, so please let us know what you think.

Florin is a Facebook Engineer.