Hi,
Thank you for the quick reply. Here is my opinion:
If a blogger wants to control the open graph tags, he/she will probably also want to control all the meta tags. Therefore, they will always have a need for another plugin and there are many free SEO plugins that do this and much more.
I would suggest you add an option to disable meta and offer more customization for the sharing bar itself … like the order of the buttons, different sizes and icon shapes, more services (send by email, g+ sahre, print etc.)
Cheers