You are used to the idea of having in your computer folders and bookmarks of things you find interesting online. This is a great way to keep organized all information you find useful or that you simply liked.
You can think of the pokenHUB as a folder to keep the useful and cool things you find in the real world organized. It's where you are going to explore the information about the places and things you collected with your Poken.
If you participate in a pokenEVENT, for example, you can collect all the brochures that interest you and have them all neatly classified in your account along with the social business cards of the people you met and everything else you collect at the event. It's an easy way to refer back to your experience.
The pokenHUB is an online library where you can keep track of all the things you like in the real world.