version 2.4.2 joomla 3
Seems content_css_custom parameter does not work.
If use custom style and set content_css_custom to templates/$template/css/editor.css.
editor.css exists but editor does not output it in header.
It seems that module parameters haven't been configured properly. Please make sure that you are using a valid twitter username, and
that you have inserted the correct keys. Detailed instructions are written in the module settings page.