We're getting this error when posting links on Facebook - from Jetpack. The site appears to be working for regular visitors although I haven't checked w/debug on yet.
(I've blanked out some directory names in the error w/x's)
Kermit Woodall
http://www.amazingstoriesmag.com/blog/
: Invalid argument supplied for foreach() in /xxxxxx/xxxxxx/public_html/wp-content/plugins/jetpack/jetpack.php on line 4534