Twitter has announced plans to start showing adverts based on users' browsing information.
The social networking site said it will be "experimenting with a way to make adverts on Twitter more useful" to users by displaying promoted content from brands and businesses a user has shown interest in.
According to a post on its blog, the company - which allows people to send public messages of up to 140 characters - said: "Users won't see more ads on Twitter, but they may see better ones."
It said the move - which technology experts say will bring Twitter in line with other social networking sites that tailor adverts - will be trialled in the US "soon".
A spokesman said: "The ad pilot is US-only and we don't have a timescale for roll-out more widely."
Twitter will tailor adverts to the individual user's browsing information - although their personal email addresses will be unreadable, Twitter said.
It also confirmed it will not receive browser-related information from its ad partners for tailoring adverts if users have DNT (Do Not Track) technology enabled.
Twitter said if users involved in the pilot do not want tailored ads then they will be able to uncheck the box next to "promoted content" in their account settings.
The Japanese government counter-terrorism practice of <a href="http://www.reuters.com/article/2007/11/20/us-japan-fingerprinting-idUST23858020071120" target="_hplink">fingerprinting foreigners who enter the country</a> may have inspired Doctor Tsutomu Matsumoto to invent "fingerprinting gels", a way of <a href="http://cryptome.org/gummy.htm" target="_hplink">faking fingerprints for scanners</a>. <a href="http://www.dansdata.com/uareu.htm" target="_hplink">Learn how</a> to make your own here.
White Noise Generator
Worried someone around you is <a href="http://articles.businessinsider.com/2011-07-28/strategy/29998051_1_bank-employee-consent-conversation" target="_hplink">secretly recording everything you do?</a> No fear! There's a relatively low-tech way to defeat such snoops, via white-noise-producing <a href="http://www.amazon.com/Productive-Home-Security-Prducts-Jammer/dp/B002PJ7PYS" target="_hplink">audio jammers</a>. These tiny devices use white noise to blur the sound picked up by hidden microphones and other surreptitious recording devices.
Hidden cameras got you down? Blind them all with a simple baseball cap lined with infrared LEDs. <a href="http://creator.wonderhowto.com/amiehold/" target="_hplink">Amie, a hacker on WonderHowTo</a>, shows the world <a href="http://mods-n-hacks.wonderhowto.com/how-to/make-infrared-mask-hide-your-face-from-cameras-201280/#" target="_hplink">how to make one</a>, while <a href="http://translate.google.com/translate?u=http%3A%2F%2Fwww.oberwelt.de%2Fprojects%2F2008%2FFilo%2520art.htm&langpair=de%7Cen&hl=en&ie=UTF8" target="_hplink">this German art exhibition</a> lays out how these ingenious devices work.
These receivers reveal the telltale electronic crackle of hidden mics and cameras. Strangely enough, they were around long before "surveillance culture" became a <a href="http://digitalcommons.law.yale.edu/ylsspps_papers/64/" target="_hplink">common phrase</a>. Today they're sold in all sorts of <a href="http://www.gadget-playground.com/bug-detection.html" target="_hplink">shops for surveillance paranoids</a>.
Sometimes hiding your face isn't enough; sometimes you don't want to be seen at all. For those days, there's camera maps. The <a href="http://www.mediaeater.com/cameras/locations.html " target="_hplink">NYC Surveillance Camera Project</a> in the US is currently working to document the location of and working status of every security camera in New York City. <a href="http://bigbrotheriswatching.co.uk/Anpr_Camera_Locations.html" target="_blank">A similar project</a> is also in progress in the UK.
Credit to artist <a href="http://ahprojects.com/" target="_hplink">Adam Harvey</a> for this one. Inspired by the <a href="http://www.bobolinkbooks.com/Camoupedia/DazzleCamouflage.html" target="_hplink">"dazzle camouflage" </a>used on submarines and warships during World War I, he designed a series of face paint principles meant to fool the facial recognition schemas of security cameras. Check out <a href="http://dismagazine.com/dystopia/evolved-lifestyles/8115/anti-surveillance-how-to-hide-from-machines/ " target="_hplink">The Perilous Glamour of Life Under Surveillance</a> for some tips on designing your own camera-fooling face paint.
Disposable mobile phones <a href="http://www.amazon.co.uk/Pre-Pay-Mobile-Phones-Communication/s?ie=UTF8&page=1&rh=n%3A10394961" target="_blank">are more expensive than you think</a>, but they don't require personal information when you sign up.
Radio-Frequency Identification (RFID) chips are now <a href="http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/rfid.htm" target="_hplink">regularly implanted</a> in passports, ID cards, credit cards and travel papers. These tiny chips make machine-reading your documents easier -- but could also let anyone with the right type of scanner <a href="http://articles.cnn.com/2006-07-10/tech/rfid_1_rfid-industry-rfid-journal-rfid-chips?_s=PM:TECH " target="_hplink">scrape your information <em>and</em> track your whereabouts</a>. Luckily, gadget geeks have come to the rescue again, this time with<a href="http://www.thinkgeek.com/product/8cdd/" target="_hplink"> RFID-blocking wallets</a>. These wallets create a Faraday cage around your items, keeping their data secure until you take them out to be scanned where they're supposed to be scanned. Destroying the chip is simpler: <a href="http://www.instructables.com/id/How-to-blockkill-RFID-chips/" target="_hplink">just nuke it in the microwave for five seconds</a>. Of course, whatever you're microwaving might <a href="http://www.youtube.com/watch?v=4_5UYcyO3Pg" target="_hplink">burst into flames</a> first...
The progress of the government's so-called 'Snooper's Charter' is currently stalled in Parliament, but using Skype may be a way to avoid officials tracking your phone calls. <a href="http://www.techweekeurope.co.uk/comment/how-to-avoid-gchq-snooping-use-skype-71410">Tech Week Europe suggests that Skype users have less cause to be worried about their data</a> being intercepted. The reasons are pretty technical, and any system is fallible, but it may be worth looking into.