Facebook fined $122 million by the EU over its WhatsApp acquisition10
This sparked an outrage from many users, and also lead to an investigation from the European Commission. Long story short, the Commission concluded that Facebook provided misleading information on two separate occasions. This made it slap a fine on Zuck and company for a total of $122 million.
This decision will not affect the approval of the merger, but it's still considered a very serious offense by the European Commission, since Facebook not only provided misleading information twice, but was also aware of the possibility to connect the accounts on the two platforms from the get-go. However, the company did “acknowledge its infringement of the rules and waived its procedural rights to have access to the file and to an oral hearing”, which the Commission listed as a mitigation factor.
All of the above had an impact on determining the final fine, which could have been up to 1% of the aggregated turnover of the companies.
source: European Commission via MacRumors