Anecdotally, the news cycle has been the hardest (internet) addiction for me to break.
I can justify deleting social media (Facebook, Reddit) because 95% of my use of it is garbage. But the news is useful, engaging. It's "entertainment with a higher purpose". Can I really justify not reading the NYTimes at all because I just "read too much"? (I was reading the news from various sites for 3 or 4 hours a day.) In the end, I decided that yes, I had to block news sites, because it was a ridiculous use of my time for a software engineer.
On the other hand, I know of no one else in my life who's had this problem.