You could go on news websites and search metalanguage like 'euphemism' or 'language' and look at recent articles, you'll often get a few good examples. I can also think of a few examples you could talk about, like Jennifer Lawrence and her 'armpit vagina'. You could think about how shows like The Project airing at 6:30PM are happy to use the word 'vagina' now that Jennifer Lawrence has used it. Do actors control how language changes? Do Americans have greater influence over language use in Australia? You might also want to consider how squirmy people were about the use of the word 'vagina' in an ad about tampons in 2012 and how last year, an ad was rejected because it used the word and then was rejected again even when they replaced it with 'down there'. (I found those by searching websites!)
Also, the NSW government promoted calling a 'king hit' a 'coward's punch' earlier this month. You could check out if the label has caught on in a few months time. I also remember that The Age had the phrase 'king hit' in the title of one of their articles but then a few hours later changed it to 'coward's punch', so do internet users control language change? Do regular people have more influence on language change than they used it?