What meta tags do #Kakaotalk and #Line read for URL preview?

To have your webpages informatively rendered on a Kakaotalk or Line messenger, what meta tags does your website need?
For line, you need to have at least these three tags: og: image, og: title and og: description.

<meta property=”og:image” content=”http://static.naver.jp/line_lp/img/ogp.png”>
<meta property=”og:title” content=”LINE : Free Calls & Messages”>
<meta property=”og:description” content=”LINE is a new communication app”>

Line URL preview
Line URL preview - Open Graph

Kakaotalk Forum

It was mentioned in Kakaotalk forum thread above that they use FaceBook Open Graph as well.

    <title>Kakao Developers</title>
    <meta property="og:url" content="https://devtalk.kakao.com/">
    <meta property="og:title" content="Kakao DevTalk_">  
    <meta property="og:type" content="website">
    <meta property="og:image" content="https://devtalk.kakao.com/images/devtalk_.png">
    <meta property="og:description" content="카카오 데브톡. 카카오 플랫폼 서비스 관련 질문 및 답변을 올리는 개발자 커뮤니티 사이트입니다.">
    <meta name="description" content="카카오 데브톡. 카카오 플랫폼 서비스 관련 질문 및 답변을 올리는 개발자 커뮤니티 사이트입니다.">
    <meta name="keywords" content="데브톡,devtalk,카카오,디벨로퍼스,개발자,API,플랫폼">

Kakaotalk URL preview
Kakaotalk URL preview - Open Graph

In short, set up your Open Graph meta tags properly.

Thanks for reading!