Almost all visa applicants to the United States will now be required to submit the social media usernames, email addresses and phone numbers they’ve used in the past five years.

The new State Department policy is expected to affect about 15 million foreigners who apply for visas to enter the United States each year, says a news report.

“National security is our top priority when adjudicating visa applications, and every prospective traveler and immigrant to the United States undergoes extensive security screening,” the department said. “We are constantly working to find mechanisms to improve our screening processes to protect U.S. citizens, while supporting legitimate travel to the United States.”

The new rules apply to virtually all applicants for immigrant and non-immigrant visas, the report says. New visa application forms will now list a number of social media platforms and require the applicant to provide any account names they may have had on them over the previous five years. They also give applicants the option to volunteer information about social media accounts on platforms not listed on the form.

In addition to their social media histories, visa applicants are now asked for five years of previously used telephone numbers, email addresses, international travel and deportation status, as well as whether any family members have been involved in terrorist activities.

Only applicants for certain diplomatic and official visa types are exempted from the requirements.