Cómo usar las colecciones:

http://www.ilusual.com/como-usar-las-colecciones-de-google-plus-guia

Google has just introduced "Collections", for Google+, a new service which allows any Google+ user to group his posts by topic and to create public, shareable collections of his favorite links, articles, videos and images.

To use Google Collections, simply go to your G+ profile page and then select "Collections" on the drop down menu appearing on the top left part of the page.

"Each collection can be shared publicly, privately, or with a custom set of people. Once you create your first collection, your profile will display a new tab where other people can find and follow your collections."

You can either create new posts containing whatever type of content inside a collection, or assign an existing, published post to a collection you have just created.

You can create as many collections as you like.

Google+ Collections is available on the web and on Android (iOS coming later).

My comment: Google+ Collections adds opportunity for creating additional value to G+ users by letting interests drive community engagement. This is a feature that sooner or later any social network will offer. 

Free to use.

Try it out now: https://plus.google.com/collections/welcome 

More info:

Official Google announcement: https://plus.google.com/+googleplus/posts/7ZpGWeou2sV 

Featured collections: https://plus.google.com/collections/featured 

See also the official review from Techcrunch:

http://techcrunch.com/2015/05/04/google-turns-users-into-content-curators-with-new-collections-feature/ 

Video tutorial: https://youtu.be/gtVNkbtS9g8