: Many of these sites are phishing traps designed to steal your login credentials. By providing an access token, you give the service full control over your private messages, photos, and personal data. Spam Generation
Example metric to flag abnormal activity: indian auto liker facebook top
Reseller panels / marketplace
: Once your account is linked to an exchange network, it will start liking random, often inappropriate, content without your knowledge, which can ruin your reputation among your actual friends. Low-Quality Engagement : Many of these sites are phishing traps