Mastercard is sponsoring tonight's Brit Awards, the 16th year it has sponsored the event. But it's had to reverse its PR firm's policy of asking its invited guests and some journalists to post pre-arranged tweets.
This started when The Daily Telegraph's diary editor Tim Walker complained yesterday that he'd been asked to tweet specific things in return for his ticket.
House PR isn't the main company handling the PR for the Brits, that's Dawbell PR, who are inviting loads of journalists and aren't requesting any special tweets for access.
House PR just represents Mastercard and had invited its own guests, VIPs and journalists as part of its sponsorship.
But any hint of journalists being told what to do doesn't go down very well in the twittersphere - so you can probably guess what happened next once people realised they could sabotage the #pricelesssurprises hashtag.
Ironically, trying to create positive press coverage through social media can create bad press coverage as everyone rushes to report on how annoyed everyone is at being told what to do.
But then again, this will probably happen.
Both the PR firm and Mastercard are adamant, despite the email, that there is no tweets-for-access arrangement.
House PR says in a statement: "The role of the PR agency is to pursue all coverage opportunities on behalf of its clients. This includes providing accurate brand references from the outset, for use across all platforms. It is a two-way conversation between the journalist and the PR in order to reach a mutually beneficial outcome. Editorial control always remains with the journalist."
Mastercard then underlined this point with a separate statement, hinting that they've had a little chat with the agency.
It said: "We have become aware of this situation and have been clear with our agency and attending media. Attendance at the Brits is not, nor has it ever been, a condition of coverage or endorsement. To imply such is highly inappropriate."