Do you want to get a new tagline or image on your WordPress site to show up when posting to Facebook? Here’s a simple tool to use, Facebook Debugger.
If you change the tagline or featured image for your wordpress site and then post a link to Facebook, it will show the old tagline/image for quite awhile, (unlike Google+ which changes it instantly).
To fix this, enter your site into https://developers.facebook.com/tools/debug/ and select “Debug” – which will bring up current/old settings. Select “Fetch new scrape information” and Facebook will now see your new settings and use this new info when you post a link from your website.