First 10 seconds impression:

The landing page seems confusing, there are at least 3/4 fonts used and the layout doesn't seem consistent, same with colours and styles, sometimes you use flat buttons, sometimes bootstrap gradient buttons.

There is not explanation of what is this for, saying collaborating and sharing nowadays is like saying that breathing.

The idea might be good but if you want people to actually use it you must give them a reason to do it and work on the design.