@jeff everything was fine when I was using Tweetbot. After it was shut down I had to start using Twitter app and it seems brain damaged. On Tweetbot I used to see (a) what people I follow wrote and (b) what people who mentioned me wrote. What I see now is neither (a) nor (b) but what seems random with a dose of pornography or scams. I thought I was doing something wrong as I never used Twitter apps before. But it seems this is quite normal. Ivory is identical experience to what Tweetbot was.