I am using Social Media Mashup as a widget, mostly displaying FB posts. This seems to conflict with some other plugins: Similar Posts and Linkwithin (lists similar posts at the end of a post), Jetpack Sharing (adds social media share buttons at end of posts) - those are the ones I am using, but this could be an issue with other plugins.
Anyway, Social Media Mashup was displaying this additional information when I only needed it to display the Facebook post text and image. Commenting out line 143 of social-media-mashup.php seems to do the trick
142. // Make this entry consistent with the site's text formatting
143. /* $final = apply_filters( 'the_content', $final ); */
Text formatting was still consistent with the site after this change, so it seems that this line doesn't have anything to do with text formatting.
Derg and Burn After Reading Magazine