If you're one of the hundreds/thousands of Twitter users who have changed their password/reviewed their Oauth access then there's an update for you.
It turns out Grader was the source of the hacked tweet. They have been quick enough to tweet this;
Working on major issue causing some unauthorized user to tweet on behalf of Twitter Grader users. Sorry folks. We're on it.HubSpot have also been quick with some outreach (outbound communication?). My initial post was commented on by Pamela Seiple, PR Manager, HubSpot. Pamela says;
We're so sorry for the problem you and others experienced caused by some unauthorized user to tweet on behalf of Twitter Grader users today, but we can assure you were working hard (even as we speak) to understand and fix the issue. We'll keep you posted from the @Grader account.My guess is that there was no connection between the password reset of two weeks ago and today. That's good.
Grader is back on my list of connected services (or I missed it on my first whirlwind check) but is marked as suspended.