Another reason Twitter is awesome: Cambridge University linguists are using it to track how the usage of one of the U.K.’s Celtic languages, Welsh, is changing. Welsh is only spoken by around a sixth of the population of Wales — or some 562,000 people — but enough of those Welsh speakers are tweeting in Welsh to have allowed the researchers to compile a database of source material to use as a jumping off point for more detailed field research. Here’s Dr David Willis, of Cambridge’s Department of Theoretical and Applied Linguistics, explaining the role Twitter played in the research — notably its usefulness to linguists is how conversational it is.