Feed option

Activity feeds:

From the main navigation, the drop down has recently active topics and unanswered questions.

Each forum has a sort view, recently active, most replies, most views, newest first. 

In addition you can also subscribe to each forum.

On your Profile>Settings and check the option for  

• Display numbers of new community activities  Yes/No

I also prefer the unread posts view, the platform does not have an unread post/topic feed for the front end, but we are working to see if we can create one via APIs!   Will keep you updated!