Following its takeover of the communication app in 2014, the European Commission has now accused the social media giant of misleading them in their investigation.
When two big corporations merge together, it is important that the European Commission complete an investigation to ensure that there will be no unfair competition issues.
Companies involved in this process are obliged to give all the accurate information they can.
Such an investigation was completed when Facebook and Whatsapp merged in 2014.
However, it has now been revealed that the app will now do something that Facebook urged the Commission at the time of the investigation was impossible.
When asked, Facebook stated that it would be impossible to link users Facebook and Whatsapp accounts. Facebook urged that they gave this information to the Commission in good faith and had nothing to hide.
However, Whatsapp announced this August that it is possible to link both accounts through the use of the phone number.
The Commission have accused Facebook of knowing this all along and deliberately misleading them during the investigation.
If the Commission concludes that it was definitely misled, either by accident or design, it could fine Facebook up to 1% of its turnover, which would amount to millions of euros.
Facebook have until the 31st January 2017 to respond so this is definitely something to keep an eye on if social media is your thing.