He means 'twitteracy' of course, even if he won't say so. "If you think "literacy" is too fancy, then just remember to use the word "social" in reasonable proximity to your mention of encoding and decoding skills needed in the mobile and multimedia milieu. It's not just about knowing how. It's about knowing how and knowing who and knowing who knows who knows what." Yeah, but this whole 'knowing who' business is over-rated. It would be a mistake to get caught up in the cliquey aspects of things like Twitter.