The Irish watchdog’s investigation centred on how Instagram displayed the personal details of users ages 13 to 17, including email addresses and phone numbers.
The minimum age for Instagram users is 13.
The investigation began after a data scientist found that users, including those under 18, were switching to business accounts and had their contact information displayed on their profiles.
Users were apparently doing it to see statistics on how many likes their posts were getting after Instagram started removing the feature from personal accounts in some countries to help with mental health.
Instagram said the inquiry focused on “old settings” that were updated more than a year ago, and it has since released new privacy features for teens, including automatically setting their accounts to private when they join.
“We’re continuing to carefully review the rest of the decision,” the company said.
Under the EU’s data privacy rules, the Irish watchdog is the lead regulator for many US tech companies with European headquarters in Dublin.
The watchdog has a raft of other inquiries into Meta-owned companies.
Last year, it fined WhatsApp 225 million euros for breaching rules on transparency about sharing people’s data with other Meta companies.