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Different people follow for different things. Some people like seeing that other stuff. It would be very helpful if Twitter let accounts tag tweets into categories, and let people choose to subscribe or unsubscribe to those. Maintaining multiple Twitter accounts for different content is very tedious. No doubt your point is valid as well, it's easy to get addicted to that platform, and the likes and notification system gamifies that need for validation.

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>>> It would be very helpful if Twitter let accounts tag tweets into categories, <<<

Something close is ‘Topics’ where Twitter automatically categorizes tweets into Topics such as Programming, Sports, Startup, etc. You can follow a topic and thus see only tweets in that group. So Mr A sends 2 tweets - one about his kids and the other about Python. If you’re following the topic ‘Programming’, you’ll only see the second tweet