Ever had someone link to your blog post from Facebook, only to see with dismay that the wrong image showed up? Or no image at all? Or even worse, that the excerpt for the article shows something completely unrelated? Ouch. Not very helpful.
Try these two WordPress plugins to help:
Facebook Like Send & Open Graph Meta adds Facebook Like and Send buttons at the base of each post on your website to make it easy for visitors to link your post on their Facebook timeline. It also adds meta information behind the scenes to tell Facebook which image to use when it grabs that link for display.
If you often post videos to your blog, you might prefer Fedmich’s Facebook Open Graph Meta. It doesn’t add the buttons to your site, but it includes a neat trick for video: the image on the Facebook excerpt is a clickable link to the video itself.