I had problems using “Twit-ee” module for ExpressionEngine so I went hunting for solutions. This error kept coming up: “Oh dear – Twitter says your request is invalid … (Error 400)”. Adjusting cache settings didn’t help.
But using Twitter’s own embed code worked well. I moved their .js file local and was able to tweak the output code easily from there and add my own classes.
UPDATE: Twitter’s own code will not display a “retweet”. so if you only want to display 1 tweet and your most recent is a retweet you get nothing. An unexpected error that they may not be aware of.
And there’s a method using google’s code.
Another great resource that includes my favorite – Twitter Tools for WordPress:
Here are 10 of the most useful ways to start turning your site readers (or your client’s customer base) into Twitter followers, and vice versa.