Often, users have used the same profile picture across multiple social media platforms (Instagram, LinkedIn, Twitter). Take a screenshot of the small thumbnail.
It is designed to prevent harassment, identity theft, and unauthorized use of photos. Common "Viewer" Methods & Their Risks
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
Many people search for a to bypass this restriction. This comprehensive guide explains how Facebook's security works, the truth behind online viewer tools, and safe ways to view profile images. What is a Facebook Locked Profile?