The unread content link isn't easily noticeable in mobile. It's the document icon in the top right. It actually does a better job at telling you what people have posted then the two blocks I have up.I prefer to look at 'latest replies,' stuff I haven't read or just the most recent. If that's not available, I look at the popular ones.
Also I'm lazy and won't click on anything usually unless both of those aren't viewavle available at a glance.