We have @CodePen on Twitter. We share all kinds of stuff we think is cool (Mostly stuff on CodePen, but not always). We link to blog posts we write. We share new features and other important announcements. But it's not really an awesome-stuff-only-firehose.
There have been a number of Twitter bots that post all the Picked Pens (or Popular Pens, or some combination). But that's a little dry.
Nate Wiley created @HotOnCodePen, which is a bit more interesting. For instance:
— Nate Wiley (@htmlnate) November 13, 2015
And, it looks like, hand-selected retweets and such. Makes for a pretty fun Twitter follow.