I'm sorry but i don't understand Q3. How can something be not important but urgent ?? If you consider something urgent, then it must be important. It's a sort of self implied fact. If it's not important, why would you want to do that thing urgently ?
And i don't get the example either, why would keeping up with Twitter be something you consider urgent ? Social media should always be something so little important that you could just do it once a week without a problem.
I think the author is implying that social media CAN have a feeling of urgency in today's world. You could also replace checking Twitter with news, sports, reddit, etc.
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