This is a product for tracking everything you do, and tries to accomplish that by pulling data from other services that track everything you do.
Is Facebook uniquely untrustworthy in this category? Is there anything about Gyroscope that makes it uniquely trustworthy, if only they gathered your data directly?
It isn't about being untrustworthy: I don't use Facebook, I use many other things but not Facebook. If he has the code to handle Facebook logins, he has the code to handle Google logins as well.
The main issue I have with Facebook is that their goal is diametrically opposed to the concept of the Internet that I would subscribe to. They are actively working toward attaining a monopoly for online social activity. In a sense, they want to become the "social wrapper" for everything that is done on the Internet.
I completely deleted my Facebook account a few weeks ago and quickly am realizing how far-reaching their monopoly already is.
This point alone - which doesn't even include the many, many privacy issues FB has - is enough for me to say I will not use a service that requires a FB login.
Let's not just assume the parent of your comment thinks Facebook is untrustworthy; how about if someone (like me, for example) just doesn't have a Facebook account?
I would like to use it but not reveal who I am. I think this is more than fair enough reason, and probably the direction these guys should move towards.
IIRC the friends list is in the default app permissions, and calling the graph API only returns the friends on your list who also gave the same permission to the app.
I don't like Facebook but I have an account because my mom and wife do too. So I choose not to connect my account with anything. Am I an unacceptable weirdo?
Even if I am in a tiny minority, I don't have a Facebook account and I would prefer to continue not having one
(motive: snobbism, more than privacy concerns).
So if a service is only available through a FB login I decline to use the service.
Is Facebook uniquely untrustworthy in this category? Is there anything about Gyroscope that makes it uniquely trustworthy, if only they gathered your data directly?