serendipity_event_social correctly generates the description like so:
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<meta property="og:description" content="entry description text"/>
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<meta name="description" content="" />
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<title>{$head_title|@default:$blogTitle} {if $head_subtitle} - {$head_subtitle}{/if}</title>
<meta http-equiv="Content-Type" content="text/html; charset={$head_charset}" />
<meta name="Powered-By" content="Serendipity v.{$head_version}" / >
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<meta name="viewport" content="width=device-width; initial-scale=1.0" />
{serendipity_hookPlugin hook="frontend_header"}