Think twice — and then think again – before plugging directly into a public USB charging station. In a Facebook post, the TSA warns that those stations are prime hunting spots for data and identity thieves, thanks to a practice called "juice jacking." Per the TSA's post, "Hackers can install malware at USB ports (we've been told that's called 'juice/port jacking'). Power outlets cannot be hacked the way USB ports can, so you can safely recharge with no worries. "Don't use free public WiFi, especially if you're planning to make any online purchases.