Children and adolescents often use the Internet (including social media) in ways that risk their privacy: a cause for growing concern among parents. Young people also may not realize that all their information and browsing can and may be tracked while visiting a particular site and that it is up to them to protect their own privacy. They must be informed about all these risks. For example, on Twitter, threats include shortened links that may lead to potentially harmful websites or content. Email threats include email scams and attachments that persuade users to install malware and disclose personal information. On Torrent sites, threats include malware hiding in video, music, and software downloads. When using a smartphone, threats include geolocation, meaning that one's phone can detect where one's location and post it online for all to see. Users can protect themselves by updating virus protection, using security settings, downloading patches, installing a firewall, screening email, shutting down spyware, controlling cookies, using encryption, fending off browser hijackers, and blocking pop-ups.