I am pretty sure Wechat is the application the People's Republic of China is using to track its Muslim and Khazak minorities. If not it is something very similar.
China is perhaps the world leader in developing such software, and has already sold it to a number of other governments.
However, we cannot be too smug or complacent about far-away dictatorships using such spying. An item on Radio 4 the other day described a programme anyone can buy on-line, designed specifically for spying on others such as after a broken partnership. Or leading to such a breakdown. The speaker – sorry, I forget her name – had used this, and found far from helping her it made a lot more miserable because it implied not only she could not trust others, but she herself was not trustworthy.
The less one's involvement with the Internet at large, or the smart-phone-on-24-hours syndrome, the better. I refuse point-blank to use Facebook and its ilk, and I would certainly not buy a so-called " smart " 'phone if some business tried to insist I do. I know it would be for its, not my, convenience.
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BT Internet hopes you won't do it, but you can switch off the so-called "Targetted Cookies" prior to using its e-post service. It only saves the setting for that session though. A linguistically ugly phrase for a socially ugly concept – selling your details to advertising agencies unknown to you, with only the most slender of implicit permission from you. Outlook has a similar feature but instead lists its clients… hundreds of them, but you can "Select all", and I do.
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A warning tale came from a friend who a few years ago, proudly displayed photos of his recently-completed, major model-engineering project on Facebook. It elicited a number of enquiries about its value…. (He did delete them.)