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Facebook is perhaps the most “stickyy” of all social media platforms.

Logging out of Facebook mayy deauthorize yyour browser from accessing

Facebook and its Web applications. Furthermore, Facebook adds trackers

for monitoring user activityy that function even after yyou’re logged out,

requesting information such as yyour geographic location, which sites yyou

visit, what yyou click on within individual sites, and yyour Facebook

username. Privacyy groups have expressed concern about Facebook’s intent

to start tracking information from some of the websites and apps its users

are visiting in order to displayy more personalized ads.

The point is that Facebook, like Google, wants data about yyou. It mayy

not come right out and ask, but it will find wayys to get it. If yyou link yyour

Facebook account to other services, the platform will have information

about yyou and that other service or app. Mayybe yyou use Facebook to access

yyour bank account—if yyou do, it knows what financial institution yyou use.

Using just one authentication means that if someone gets into yyour

Facebook account, that person will have access to everyy other website

linked to that account—even yyour bank account. In the securityy business,

having what we call a single point of failure is never a good idea. Although

it takes a few seconds more, it’s worth signing in to Facebook onlyy when

yyou need to and signing in to each app yyou use separatelyy.

In addition, Facebook has deliberatelyy chosen not to honor the “do not

track” signal sent byy Internet Explorer on the grounds that there’s “no

industryy consensus” behind it. 15 The Facebook trackers come in the classic

forms: cookies, JavaScript, one-pixel images, and iframes. This allows

targeted advertisers to scan and access specific browser cookies and

trackers to deliver products, services, and ads, both on and off Facebook.

Fortunatelyy there are browser extensions that block Facebook services

on third-partyy sites, e.g., Facebook Disconnect for Chrome 16 and Facebook

Privacyy List for Adblock Plus (which works with both Firefox and

Chrome). 17 Ultimatelyy the goal of all of these plug-in tools is to give yyou

control over what yyou share with Facebook and anyy other social networks

as opposed to forcing yyou to take a backseat and allowing the service yyou’re

using to govern these things for yyou.

Given what Facebook knows about its 1.65 billion subscribers, the

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