reading from another thread here I understand that the facebook plugin is incompatible with various other plugins (Disqus etc.)
Interestingly I run my wordpress without having a single plugin installed and yet receive the same error as reported there when trying to get my first post published to the Open Graph:
Warning: Invalid argument supplied for foreach() in /home/xxx/public_html/wp-content/plugins/facebook/fb-social-publisher.php on line 255
Warning: Invalid argument supplied for foreach() in /home/xxx/public_html/wp-content/plugins/facebook/fb-social-publisher.php on line 297
Warning: Cannot modify header information - headers already sent by (output started at /home/xxx/public_html/wp-content/plugins/facebook/fb-social-publisher.php:255) in /home/xxx/public_html/wp-includes/pluggable.php on line 866
I run a very simplistic, self-written theme, that IMHO shouldn't interfere with anything in regards to that facebook plugin. I do, however, use facebook like, google+ 1 and twitter buttons from the respective resources. I have already tried removing all of those from the theme but to no avail - the error stays the same.
Does anyone have any ideas, where to start looking for a solution to this? Any input will be greatly appreciated, so thank you in advance.