[jeromegv]

Yes and no, just like any major media platform, huge majority of tweets being seen are from a very small group of influencers/popular person. That's why when you join twitter, it suggests to you a lot of people to follow that are already big.

[brabel]

There's only a yes in your answer.

[FalconSensei]

No. You can have only 10% of accounts actively tweeting and the rest just consuming what those post. All those - active and not - are monetizable