As you can see below I use the popular SexyBookmarks. Recently, I updated it and got the following error:

Fatal error: Cannot use string offset as an array in /plugins/sexybookmarks/includes/public.php on line 112

The issue comes from having bit.ly as your URL shortner. Visit the configuration panel of your SexyBookmarks and change the URL shortner to something else like tinyurl. You can find more on the Sexybookmarks’ update page.