Sign anyway. We started with five campuses because we had people there, not because the rest don't count. Enough names from one school is how it becomes a campus.

Only your name, school and major, and only if you leave the box unchecked. Never your percentage, never your career answer, never anything else you tell us. Check the box and you're counted but not named.

One that publishes what happens to your money, how many people, what result, at what cost, and lets outsiders check the work. GiveWell exists to do that checking. The giving pledge runs with Giving What We Can, who have been asking people to put a number on it since 2009 and have a version built for students who aren't earning yet.

Less than you'd expect, on purpose. You get one short email a month with projects, fellowships, jobs, and what other people decided to do. You get everyone else who signed, at your school and elsewhere, including Circles — small groups that meet to talk about this instead of thinking about it alone at 2am. There's a Summit in November. And once a year we ask how it's going. A newsletter isn't going to change your life. It's a thread back to something you decided, so it doesn't quietly disappear.

You probably will about something. There's no contract and no money changes hands here. Once a year we'll email and ask how it's going, and you can update your answer, keep it, or ignore us.

Yes, right up until you tell people. That's what the wall is for.

Almost nobody does at your age, and that's the reason to sign now rather than later. The career pledge is about how you choose, not what you choose. You're promising to pick on purpose instead of taking whatever shows up first.

Then take the giving pledge, and don't treat it as the consolation prize. Somebody has to make the money, and ten percent of that salary over thirty years moves more money to more problems than most people who work on those problems full-time ever will.