oEmbed on vBulletin?

[cellarius]

So, you would have them post a URL to that service, then parse the answer accordingly? That's not trivial.

You could perhaps do it using an addon I once did, making bbcode with php callback available. https://vborg.vbsupport.ru/showthread.php?t=264896. Create a twitter bbcode, pass the URL to the PHP script, call oEmbed, parse the answer and create a html output accordingly.

If I understand what you want correctly.