David Pogue:

Not long from now, Facebook will be a frighteningly centralized database containing the information of about a half-billion people.

Kurt Partridge:

I don't think the field has really realized ... how informative it can be.

Decius:

Money for me, databases for you.

Erica Naone:

The site's 400 million users have an average of 130 friends each, and just this social graph data is tens of terabytes in size.

The site has long been the largest photo-sharing site on the Web ...

It's stunning to contemplate how large a responsibility the company has for information belonging to a growing number of people around the world.

Kristina Grifantini:

To address privacy concerns, they designed SoundSense so that ... a user can tell the software to ignore any sounds deemed off limits.

Tanzeem Choudhury:

A system that can recognize sounds in a person's life can be used to search for others who have the same preferences.

Christina Hendricks:

No man should be on Facebook.

Cordelia Dean:

There are those who suggest humanity should collectively decide to turn away from some new technologies as inherently dangerous.

S.C.:

Like Facebook, the dollar may not be the best system around, but it's what everyone else uses, hence it's hard to displace.

David Petraeus:

Hard is not hopeless.

danah boyd:

4chan is ground zero of a new generation of hackers who are bent on hacking the attention economy. These attention hackers are highlighting how manipulatable information flows are.

Jeff Bezos's grandfather:

One day you'll understand that it's harder to be kind than clever.