You can only revisit them when they appear on your notifiy.
If you click on the title of the topic, it will redirect you to a page. You can click on "Like" button. It will make a shortcut on your homepage**. Hmm its similar to the pin feature on pinterest.
All topica you liked will appear here http://www.mangago.me/home/people/468513/favorite/
*on your notifications
Topics shown there are your own topics. You cant see posts from other people where you commented/followed :>
Yup
How do you revisit followed posts? Or is it only possible to see them once someone comments on the post?