I'd like to report that the meta twitter:description breaks if any quotes are used within it. It effectively omits everything after the quite.
For example, I have a meta description in my article that looks like this:
Internet security patents company Secure Axcess LLC claims Wii U infringes upon their "Multiscreen personal computer display method and apparatus" patent.
You can see the error here, in the Twitter Validator where it's chopped off. As a result, it's also produced an error in the HTML.
P.S. What's your email address for PayPal donations? Your plugin documentation only has an Amazon France wishlist. Thanks for everything you do.