If revising ENGA1 using the visual channel (your eyes) is too much for you, then try something through the aural channel (your ears).
Here's a new episode of Radio 4's Digital Human which talks about how the internet has changed some of the ways we interact. It's not specifically about language throughout, but it's good background for Language and Mode.
Then this is a 15-minute lecture by acclaimed US linguist, John McWhorter on texting and language change. You can read more about it here too. It's very useful for both AS Language and Mode or A2 Language Change and Discourses.
Last Friday's The One Show had a great segment on the changing accents of London, with particular focus on MLE and Cockney, so that fits very nicely with the topic we've just started in ENGA3. You can catch it here until Friday 26th April and the bit you want is from 11 minutes in.