We've always believed that popular culture and populist politics go hand in hand. It's an honor to be working with so many respected and influential artists, and we're indebted to them for having the courage to speak out at a time when our country so desperately needs change. For our 2.5 million members and far beyond, the Vote for Change tour will have a seismic cultural impact.

Your filter bubble is your own personal, unique universe of information that you live in online. What's in your filter bubble depends on who you are, and it depends on what you do. But you don't decide what gets in - and more importantly, you don't see what gets edited out.

Facebook was looking at which links I clicked on, and it was noticing that I was clicking more on my liberal friends' links than on my conservative friends' links. And without consulting me about it, it had edited them out. They disappeared.

By constantly moving the flashlight of your attention to the perimeter of your understanding, you enlarge your sense of the world.

We've always believed that popular culture and populist politics go hand in hand. It's an honor to be working with so many respected and influential artists, and we're indebted to them for having the courage to speak out at a time when our country so desperately needs change. For our 2.5 million members and far beyond, the Vote for Change tour will have a seismic cultural impact.

In the last year, grassroots contributors like us gave more than $300 million to the Kerry campaign and the DNC, and proved that the Party doesn't need corporate cash to be competitive. Now it's our Party: we bought it, we own it, and we're going to take it back.

It feels great to have your own views reflected back to you, and you feel so right, but actually it's very dangerous. Because to make good decisions, you need to have a clear view of what all the options are.