Social Metas

Hi all !

I think it would be great to add social metas to PunBB (extension maybe ?).
For those who don't know what are OpenGraph and Twitter Cards, here's some basic code to show you how it works.

<meta property="og:title" content="POST TITLE">
<meta property="og:type" content="article">
<meta property="og:url" content="POST URL">
<meta property="og:image" content="IMAGE URL">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="@TWITTER USERNAME">
<meta name="twitter:creator" content="@TWITTER USERNAME">
<meta name="twitter:title" content="POST TITLE">
<meta name="twitter:description" content="POST SUMMARY">
<meta name="twitter:image" content="IMAGE URL">

The idea is to add a thumb on Facebook and Twitter (most social sharing are using OpenGraph). You social post get more visibility. PunBB is 10 years old and for me this is essential. There was a lot of work on SEO with the lastest releases. The next step is social optimisation.

It's easy to get current url of a post but it could be awesome if we get the first image URL in post or show a default image if we can't find one. Any idea how to do that ?

Thanks !