It's now common to watch sports on TV while surfing the Web on a laptop or smartphone to check on fantasy football scores, according to Genevieve Bell, an anthropologist at Intel.

Jahanara Kashen: I am able to feed my family, and Mr. Felton can devote more time to his fantasy football team.

Like all other immersive games - including tennis, fantasy football and chess - Twitter is spellbinding when you're in it, and seems nuts and like a sicko waste of time when you're not.