I have created a scoop.it topic for my geometry students and for other geometry teachers.  For starters, I have scooped my own geometry class website, the Hammond HS math department website, the Khan Academy website, and YouTube.  These four links alone lead students to a huge amount of geometry resources.  Other teachers can view this page as well and find resources that are concentrated into one topic focus that they may otherwise have more difficulty compiling to share with their students.

The link to my geometry scoop.it page can be found here.
To make your own scoop.it page, sign up for a free account here.