Some Facebook applications have been leaking user information –
specifically, Facebook UIDs – to third party companies, the Wall Street
Journal reports.
The apps in question have a huge combined userbase; according to the WSJ,
all of the 10 most popular Facebook apps are guilty of giving away user
IDs to third parties, specifically Internet research and advertising
companies.
These include Zynga’s FarmVille, Texas HoldEm Poker and FrontierVille; according to AppData, FarmVille alone had more than 80 million users in February 2010.
Facebook confirmed some of the issues in a blog post, claiming most of the apps in question shared the user IDs inadvertently, due to “technical details.”
“Our
policy is very clear about protecting user data, ensuring that no one
can access private user information without explicit user consent (…)
Recently, it has come to our attention that several applications built
on Facebook Platform were passing the User ID (UID), an identifier that
we use within our APIs, in a manner that violated this policy. In most
cases, developers did not intend to pass this information, but did so
because of the technical details of how browsers work,” the post said.
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Earlier
this weekend, Facebook blocked LOLapps, one of the biggest social games
providers on the Facebook platform, due to “violations of Facebook’s
terms.” The WSJ claims that some of the apps created by LOLapps
were also transmitting user info to third parties. LOLapps (whose apps
have now been reinstated on Facebook) has confirmed this was the case in
a blog post, claiming it shared the info inadvertently.
Facebook
also said that “knowledge of a UID does not enable anyone to access
private user information without explicit user consent.”
This is
true, but Facebook UID can be very revealing, depending on the user’s
privacy settings. Knowing the ID of a Facebook user who shares
information with “Everyone” can potentially give you access to his/her
name, phone number, e-mail, photos and other personal info. Even if a
user has set the strictest possible privacy settings on his/her account
on Facebook, the ID may still reveal his/her name and Facebook friends.
And
then there’s the issue of scale. If an application with tens of
millions of users shares Facebook UIDs with an advertising company,
that’s a lot of data. Depending on your privacy settings on Facebook,
this particular advertising company now may only know your name and the
names of your friends, or much more. But the real question is one of
trust: have you agreed to any of this, and do you want to be in this
company’s database?
This is another in a long line of Facebook’s privacy missteps. Although Facebook claimed
time and time again it’s doing everything it can to preserve its users’
privacy, this latest incident won’t do much to convince its users that
this is really the case.
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