This extension auto-detects plain URLS in posts and private messages and fetches the OGP tags if any. With Open Graph (OGP) tags provided, it's possible to convert the URL to a rich "Facebook-style" block with image, heading and intro. The Open Graph protocol is described here.
Copy the extension to phpBB/ext/ger/magicogp
Go to "ACP" > "Customise" > "Extensions" and enable the "Magic OGP parser" extension.