[toomanybeersies]

Facebook performs secret psychological experiments on its users by manipulating their news feed: https://www.theguardian.com/technology/2014/jul/02/facebook-...

I would say without their consent, but it's likely there is a clause buried in the user agreement that means that you consent to it.

[uiri]

If their users did not read that clause in the user agreement and knowingly consent to the experiments, then they are being carried out without the users' consent.

[lostgame]

Are EULA’s still legally binding? I thought there was a recent case against that.

[gruez]

hence why the question should be about informed consent.