Does Twitter load other web content through a built-in web browser in the app? That seems to be the big "white-washing" problem with the various reader apps (Facebook, Flipboard, etc), that they're unifying the interaction experience.
On iOS, yes, it has a built-in browser. You can go to Safari if you like.
They're not packaging up web content as if it's not web content, though. It's just to access sites quickly.
And I've gotta say, I'm really bothered by the way Facebook handles browsing. I have to copy the link, exit Facebook, open Safari, then paste and navigate to the link whenever I want to have a page I found on a Facebook post in my bookmarks, reading list, etc. Super frustrating.
If I open a link in Facebook, tap "Share", I see "Share in New Post", "Send in Messenger", "Copy Link", "Open in Safari", and "Save Link".