How do I do Twitter?

[BathroomLights]

For example, here is Madonna's account. I can see what she has written but where are the things people have written to her?

If you tap the post near the writing it will open up and you will be able to read comments or comment yourself.

Tap on the time stamp (eg. 6h) to see the comments.
I am pretty sure only her PR ppl read the comments, she sure won't.