Facebook has created a link that will let users access it from the anonymising Tor network, in a bid to counter ongoing privacy concerns post-PRISM.
Facebook software engineer for security infrastructure Alec Muffett announced the service, listing it as a key way customers can protect their data from cyber criminals and state spooks.
"Facebook's onion address provides a way to access Facebook through Tor without losing the cryptographic protections provided by the Tor cloud," he explained.
"The idea is that the Facebook onion address connects you to Facebook's Core WWW Infrastructure and it reflects one benefit of accessing Facebook this way: that it provides end-to-end communication, from your browser directly into a Facebook datacentre."
The service can be accessed from the https://facebookcorewwwi.onion/ web link on all Tor-enabled browsers.
Tor is a custom network designed to let people surf the internet anonymously and host web services without having them index on the public open internet. Prior to the link, while Tor users could connect to Facebook, the site would regularly crash or throw up unusual bugs.
Muffett said the service is in its early stages but promised Facebook is planning to roll out a number of upgrades in the very near future.
"Over time we hope to share some of the lessons that we have learned - and will learn - about scaling and deploying services via the Facebook onion address; we have many ideas and are looking forward to improving this service," he wrote.
"A medium-term goal will be to support Facebook's mobile-friendly website via an onion address, although in the meantime we expect the service to be of an evolutionary and slightly flaky nature."
Use of the Tor network and other anonymising services has been on the rise since whistleblower Edward Snowden leaked the notorious PRISM documents to the press in 2013.
The documents showed the US National Security Agency was siphoning vast amounts of customer data from technology firms including Facebook, Twitter, Microsoft and Google.
Tor has also become an increasingly popular tool within cyber crime communities and over the last year numerous attacks have been uncovered leveraging its anonymising power.
Trend Micro security engineers reported finding an elusive variant of the Bifrose malware that leverages the Tor network to hide its communications targeting an unnamed device manufacturer in August.
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