fixed encoding issue

git-svn-id: https://plugins.svn.wordpress.org/tweet-old-post/trunk@960823 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed facebook issue

git-svn-id: https://plugins.svn.wordpress.org/tweet-old-post/trunk@960825 b8457f37-d9ea-0310-8a92-e5e31aec5664