This depends on the platforms you use and the data you enter there.  Because you have no control over the data security of these platforms, almost all the information that exists about you can end up on the internet and be accessible to third parties, including: Personal information (name, address, contact details, email address, social security number, etc.) Bank, credit card, and tax data Logins and passwords (e.g., for email accounts, social media, or online banking) Health data (medical records, medical records, and insurance information) Workplace data (employment contracts, employee data, and payrolls) Sensitive information does not necessarily have to be leaked onto the internet through security breaches. Often, data theft, hacker attacks, or phishing are behind it.  To protect yourself, you should always use strong passwords, regularly update your software, and never open e-mails or text messages from unknown senders or click on links in them.