Hmm, setting up a wordpress blog and looking at various plugins before messing up code myself….
The Yoast SEO plugin seems pretty popular, and it also has some useful Facebook functions; adding open graphics meta tags…
The (offical) Facebook wordpress plugin has, well the official stuff. You can add an app id, and it lets you add all the various social plugins, attached to your app.
Activating both Yoast SEO and the Facebook plugin causes a problem however. The Facebook wordpress plugin removes the Yoast SEO open graphics meta tags. On itself not such a problem, but the Yoast SEO plugin has a nice function of adding pictures of a post to the open graphics meta tags…..
Needs further reseach….