This plugin recommends the end user installing a button or a highlighter to use with this. So what does the plugin itself do for the WordPress blog/site? If the reader needs a highlighter, what does the plugin do on its own? My readers aren't going to install a highlighter just to have this function.
For example, in the instructions it says to add rooh.it/ to the beginning of any url to highlight text and tweet it instantly. To do this, one must have software installed. It doesn't just magically work. :P So is this plugin a sitewide version for all readers of my blog, or is this to make it so I can tweet my own posts? Because tweeting one's own posts is not "viral," or anything original at all.
I admit I'm frustrated with the lack of clarity on this plugin's page with detailing the difference between this plugin and the recommended software.