Facebook Poke

Former TechCrunch senior writer Jason Kincaid is just young enough to remember those days and, in the book, he explains feature-by-feature how Facebook went from something most "grown ups" said they'd never use to something nearly 1 billion people can't live without.

"Poking" someone on Facebook may sound like a naughty double-entendre, but generally speaking it's a perfectly harmless (and totally G-rated) way of g...