While on the topic of the "SEO Meta Description" -- for Facebook's OpenGraph protocol, I'd like to suggest adding two additional lines to html.inc.php to make the page pass validation @ https://developers.facebook.com/tools/debug

AFTER LINE 314...
Code
<meta property="article:section" content="' . $forumTitle . '" />

ADD...

Code
<meta property="og:image" content="'. $config['FULL-URL-TO-HEADER-IMAGE-LOGO'] .'" />
<meta property="og:site_name" content="'. $config['COMMUNITY_TITLE'] .'" />

Where "FULL-URL-TO-HEADER-IMAGE-LOGO", insert the full url to your site's header logo.
For example, https://www.ubbcentral.com/images/logo.png
Note: The recommended size is 200x200 or larger, and the image should be square.

The code for the "FULL-URL-TO-HEADER-IMAGE-LOGO" string could be another category addition to "Control Panel > Display Options" @ admin/gen_display.php

Current developer of UBB.threads PHP Forum Software
Current Release: UBBT 7.7.5 // Preview: UBBT 8.0.0
isaac @ id242.com // my forum @ CelicaHobby.com