Researchers and students conducting online surveys with LimeSurvey often share their survey link on social media like Facebook or Twitter. These platforms automatically render the link with a preview image, a headline and short description if the linked source provides the required information in form of the Open Graph protocol meta data. The delivered basic LimeSurvey templates/theme do not include the relevant code lines but can be extended easily.
Simply extend the basic template/theme, modify the head.twig file and add the following highlighted lines before the title tag. You still need to change the BASEURL and upload a preview image to the template folder.
<meta property="og:title" content="{{ aSurveyInfo.name }}" > <meta property="og:description" content="{{ aSurveyInfo.description }}" > <meta property="og:type" content="website" > <meta property="og:image" content="BASEURL{{ aSurveyInfo.oTemplate.sTemplateurl }}files/FILENAME" > <meta property="og:url" content="{{ aSurveyInfo.url }}" >