Nicholas Carr's "The Shallows" and William Powers's "Hamlet's Blackberry"

THE SHALLOWS

What the Internet Is Doing to Our Brains

By Nicholas Carr

Norton. 276 pp. $26.95

HAMLET'S BLACKBERRY

A Practical Philosophy for Building a Good Life in the Digital Age

By William Powers

Harper. 267 pp. $24.99

I'm your only friend

I'm not your only friend

But I'm a little glowing friend

But really I'm not actually your friend