I use Pinboard.in for bookmarking. I'll have to check this out. Right now I just have a button on my homescreen.

A more or less obsolete app with a confusing interface logic (try switching the source feed you want to view, there's no visual feedback about what's active now), you even can't login to your pinpoard account to save the bookmark you're reading to your pinboard bookmarks.

Simply subscribing to the global or tag feeds from pinbaord you're interested in with your favorite rss reader is the better choice.