Each service is independent (you might only use 1 of them, or all X)..but tagging is probably the simplest to explain. Say you run a site that display videos a

Each service is independent (you might only use 1 of them, or all X)..but tagging is probably the simplest to explain. Say you run a site that display videos and you want people to be able comment on certain parts. You'd hook into the the tagging api to let users tag the videos. Here's a working demo..you can click on the tag that I added, or add your own.. http://little.io/playground2 http://little.io/playground2