Facebook

Facebook remains a privacy nightmare, tracking you across the entire web via Meta Pixel and building shadow profiles of non-users. It has been fined over $5 billion globally for violations it treats as business expenses, yet continues to amass behavioral data. Compared to #3 Instagram, Facebook's cross-site tracking is more pervasive, affecting 200 million websites, and its use of facial recognition on uploaded photos remains poorly controlled, making it a data vacuum that dwarfs the average competitor.