Does anyone remember using teletext regularly, in the 80s and 90s? In a way, it was a forerunner to having the internet at home, and being able to look things up quickly. I think I used it more than I actually watched TV (I was a teenager then). I used to love the jokes, 'Zine, and Backchat, where people (usually teenagers) could send in comments; and if you were lucky, yours would be screened. When you were able to send in comments by email, instead of by phone, post or fax, this was a novelty. "Ask permission to use the phone!" was the stern warning that came with this.
A hot topic on Backchat was the Teletubbies, then a brand new programme, which lots of teenagers liked to watch. I remember one comment on Backchat, which I think sums up the whole of modern social media: "I love reading Backchat, and watching you all making ridiculous comments about stupid things. Keep up the good work, everybody, it's so funny!"