The forum now has auto-embedding of Tweets! Simply "copy link to tweet" from your Twitter client, and paste it (the complete URL) in a post, and you will get a nice little panel. So....
https: // twitter. com /britishkendama/status/644370317918535680
...(without the spaces) gives you this:
https://twitter.com/britishkendama/status/644370317918535680
Hooray for SMF mod writers!