This is quite an impressive toolbar with plenty of user interaction. I have to say though that I’m not a fan of these toolbars as it’s like pushing people into something that they don't want to do. I opted to go for the Apture search and share bar which doesn't have nearly as many options and hides away until the user scrolls down the page, it’s also quite unobtrusive but operates throughout your site with embeds and search capabilities. It’s always hard to find a balance for your reader’s pleasure without annoying them.
