The Personal Localised Network (PLN) is a development of the idea of Ubiquitous Computing that really started to kick off when the iPhone came out in 2008. After the first jailbreaks, a few hackers started using the iPhone as a localised personal server for various projects. They'd run wireless access points into specially hacked apache servers; they'd bluetooth HUD units in as well as customised controllers made into gloves, into sleeves; they put RFID tags on everything they owned so they could see where it all was at once; they put massive sensor arrays over their clothes in order to create three dimensional maps of the local area that they could overlay with their everyday sight. They plugged everything into everything, and plenty of other people copied them. Some of the technology even found itself corporatized, particularly by Apple, Google, and MR5ive.
It wasn't too long before people worked out the design flaw. If you plug everything you own into everything else, then just one of those things being a little less secure than the rest, and everything you own is suddenly owned by some tech-head kid halfway across the world. So, people got smart. They prioritised what they wanted on the core PLN, and everything else was firewalled. You can access your RFID-tagged item's location directly from the HUD, but an online process (or person) can't check your GPS without it running through your own personal firewall. People you allow, your girlfriend, your best friend, can see exactly where you are all the time, but someone would have to break into their PLN in order to spoof your firewall. It's become all too noticeable in recent days that MR5ive did not keep up to date with PLN security.
That's not to say it doesn't happen, of course. But you expect a little risk when you live in the future.