If you’re wondering whether you were one of the 87M Facebook users whose data was accessed by Cambridge Analytica, you may find out today. For Brits, at least, the BBC reports that users will receive one of two messages this afternoon letting them know whether or not they were affected …

The news was tweeted by the BBC’s Silicon Valley reporter Dave Lee.

It’s likely that the same will be true of users in the US and elsewhere.

Reuters reports that Facebook CEO Mark Zuckerberg is meeting with a number of lawmakers today, ahead of testimony to Congress tomorrow. Zuckerberg is due to be grilled by the Senate Commerce and Judiciary committees.

Zuckerberg doesn’t appear entirely confident of his ability to strike the right note in these hearings, as the NY Times claims that the CEO is being coached in how to present himself and his company.

The planned meetings at Capitol Hill are expected to continue through Monday afternoon and include some lawmakers from committees before whom Zuckerberg is due to testify, said the aides, who asked not to be identified because the meetings have not been made public.

The goal is said to be to make him appear ‘humble, agreeable and forthright.

Facebook has hired a team from the law firm WilmerHale as well as outside consultants to coach him on questions lawmakers may ask, and on how to pace his answers and react if interrupted, according to people close to the preparations, who would speak only anonymously because the sessions were private. Facebook has also set up mock hearings involving its communications team and outside advisers who role-play members of Congress.

Cambridge Analytica wasn’t the only company using Facebook quizzes to gather user data. CNBC reports that a data analytics firm called CubeYou was doing exactly the same thing.

Facebook says that it has suspended CubeYou from Facebook while it investigates.

The company sold data that had been collected by researchers working with the Psychometrics Lab at Cambridge University, similar to how Cambridge Analytica used information it obtained from other professors at the school for political marketing.

The revelation is likely to increase pressure for regulation, as Facebook said that it cannot itself control data that companies mislabel. Republican senator John Kennedy said that the problems uncovered may be ‘too big’ for the company to solve, and that legislation may be needed, reports Reuters.

Apple CEO Tim Cook is one of those who have argued that ‘some well-crafted regulation is necessary.’

Asked if lawmakers need to seek regulations on Facebook, Kennedy replied: “It may be the case.”

Facebook said last week that the #DeleteFacebook campaign wasn’t having any measurable impact, but the latest high-profile person to announce they are quitting the platform is Apple co-founder Steve Wozniak. Woz told USA Today why he’d made the decision.

Finally, with Facebook giving ambiguous responses to whether or not it will extend European-standard privacy protections worldwide, a coalition of US and European consumer groups is calling on the company to do so. CNET reports that new GDPR laws should serve as the baseline worldwide.

Wozniak said he’d rather pay for Facebook than have his personal information exploited for advertising. And he heaped praise on Apple for respecting people’s privacy.

“Apple makes its money off of good products, not off of you,” Wozniak said. “As they say, with Facebook, you are the product.”

We’ll doubtless be hearing lots of coverage of Zuckerberg’s Capitol Hill testimony over the next couple of days.