On Language Log, the linguist Geoffrey Pullum has some interesting observations about the Twitterism "to tweet." Pullum writes, "The verb tweet is gradually developing its own syntax according to what it means and what its users regard as its combinatory possibilities." Read his post and the extended comments here.

On Bloggingheads, Visual Thesaurus executive producer Ben Zimmer joins fellow linguist John McWhorter to talk about a wide range of language issues, from new approaches to the teaching of English to the language of "Mad Men." Watch the conversation here.

Still mulling over Sarah Palin's use of the word refudiate? Check out these two commentaries. In his Good magazine column, Visual Thesaurus contributor Mark Peters uses Refudiate-gate as an opportunity for a "Sarah Palin retrospective" here. And Geoff Nunberg argues on NPR's "Fresh Air" that the reactions to Palin's gaffe were more telling than the gaffe itself, here.

Robert Lane Greene, a journalist for The Economist who contributes to the magazine's excellent language blog Johnson, has contributed a fascinating column on the Macmillan Dictionary blog about American English. Greene uses his own personal linguistic biography to question the whole idea of a monolithic "American English." Read the column here.

The blogosphere has been abuzz over Sarah Palin's use of the word refudiate in a Twitter update, apparently mashing up refute and repudiate. Now OUPblog, the official blog of Oxford University Press, weighs in. "Refudiate this, word snobs!" chortles OUP lexicographer Christine Lindberg. Read all about it here.

For "Oops," the latest episode of WNYC's Radiolab, Visual Thesaurus editor Ben Zimmer shares examples of unfortunate search-and-replace errors. (Did you know Queen Elizabeth lays 2,000 eggs a day?) Listen here, and check out Language Log for further reading.