I've used Pinterest to share ideas with my girls. Recently we've used it to design quilts. I create a shared board and pin quilt patterns, fabric collections, color combinations, etc. They can comment and add suggestions. It works especially well with my daughter who lives in another state. And I also use the quilting designs for reference and inspiration. It's nice to have them all in one place. Yes there are dead ends, but I mostly pin for the pictures. Bookmarks are great but you lose them if your computer crashes (been there) or you get a new computer (done that). My pins are available on my computer, iPad, and iPhone, pretty much wherever I go. My color combinations board comes in handy when fabric shopping.
To each his own. I find Pinterest very useful.