been using your plugin for a long time now, and after updating to 1.6 I got the following issues as stated using the facebook debug tool
1. my homepage (is_home)gets a blank title, thus giving an error in debug, as in 1.5.2 it gives no error
2. the property og:title has 2 blank spaces in the beginning, in 1.5.2 it doesn't. ex:" mytitle"
Revert back to 1.5.2