Q: Do Snapchats really disappear?
A: There's ample evidence that they don't. It wasn't that long ago that 98,000 Snapchat files were released publicly when hackers breached a third-party app that let people save Snaps.

Q: How do I navigate Facebook's privacy settings?
A: The settings change often, so it can be tricky. But the site's Privacy Checkup feature can walk you through them.

Q: Can people tell from my Instagram posts where I am?
A: If your profile is public and you tag your location, anyone can see where they were taken.

Q: Who keeps track of what I do on social media, and why?
A: Companies mine the data we share to better market their products. Your posts, purchases, browsing history—these are tasty bread crumbs because they speak volumes about you. Target, for example, knew a teen was pregnant before her own family did, all based on her purchase history.

Q: Does the government put my Facebook screeds against congress in a file somewhere?
A: Unless you're threatening violence, it's more likely that you're just influencing how your contacts perceive you—which is concerning since they're in a position to potentially hire you or refer you for a job.

Q: How do you spot a catfish (a person who creates a false persona to lure the lovelorn)?
A: If it sounds too good to be true, it probably is. If someone has a beautiful profile photo but few friends, or balks at meeting up, that's a red flag.

Q: How do I stay safe on dating apps and sites?
A: If you're meeting up, have a public-places-only rule at first. Don't add anyone to your social media—or share too many details—until you've met in person several times.

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