I recently discovered a bug/ an issue when you have Jetpack installed and the Sharing buttons enabled and have the Google+ button on your post. If you have all these enabled, and then go to a post and add "?share=google-plus-1" to the URL, you get a blank white page.
Here is example page on my site:
http://techtalk.virendrachandak.com/how-to-make-wordpress-menu-item-open-in-new-window-tab/?share=google-plus-1
However, if I try a URL with any other sharing service name, it redirect to the correct sharing service.
http://techtalk.virendrachandak.com/how-to-make-wordpress-menu-item-open-in-new-window-tab/?share=facebook
http://techtalk.virendrachandak.com/how-to-make-wordpress-menu-item-open-in-new-window-tab/?share=twitter
This issue is occurring on all posts when we add the "?share=google-plus-1" to the URL.
When I tried to debug this, i disabled all plugin and enable each plugin 1 by 1. I found that when I have Jetpack + Sharing enabled and have Google+ button in sharing the issue occurs. If I even remove the Google+ button from sharing I no longer have the issue.