> I think the addiction began as soon as I started to work at a desk behind a computer which had internet access

Interestingly, my digital consumption for idle entertainment dropped when I started working full time. I didn’t want to be in front of a screen when work was done.

My screen exposure for fun is primarily this site (where I spend too much time), and games where my friends and I treat the time as a multi-way group call with long distance friends.

I do know a lot of people who followed the exact course you describe: They watch screens at work and had periods where it was okay to spend a lot of time on social media or social news sites (Hacker News, Reddit, Slashdot, Digg, depending on the era). Checking those sites all day long became a habit for them and filled all idle time. Whenever they felt uncomfortable or bored, visiting a site would fix it.

Some of them broke out of it when they switched to workplaces where it wasn’t acceptable to do non-work things during the day. This is almost inconceivable for a lot of tech workers who have had a lot of freedom to date, but it’s normal in some industries. As an example, I have friends who work in areas where security concerns are so high that they check their phones into lockers before entering their work areas. Others worked at companies who did over-reaching analysis of computer use. Many just moved to companies with packed open office spaces where it would be obvious to everyone around if you were on Reddit or looking at your phone instead of the computer for an excessive amount all day.

What is interesting is that this seems to induce a split: Some people get broken of their Internet use habits this way and continue not using those sites outside of work. Others seem to have a rebound where they leave work and start gorging on Reddit or TikTok or their other preferred sites.