The Open Graph - EasyBlog plugin is meant to try to determine and set the best Open Graph and Twitter Card tags to set for your EasyBlog content. Those tags are used by many different features, like social sharing and autoposting.
However, if you're happy with the tags that EasyBlog is already setting (and it sounds like you should be, since ours weren't working very well for your site for some reason), you can definitely disable that plugin. All other features of JFBConnect will continue to work just fine, including our sharing options... they'll even work with the tags that EasyBlog is setting as well, so you won't be loosing any functionality from either extension.
I hope that helps explain,
Alex