----- Original Message -----
> We have your facebook cookie, which is equivalent to identify you. We are not
> storing anything extra here. As a UA, we simply have this info.

What would happen in a situation where I use a friend's computer or public 
computer to check facebook?  Would we just start autosyncing everything to that 
system?  What happens if I then panic and start deleting things because I don't 
want my data there and I have no idea what's going on?  What happens when I'm 
done and forget to clear my cookies, or someone else comes along after me and 
deletes all that data?

We should never surprise the user, particularly in situations where their 
personal data is involved.  The act of initiating a sync to a new device should 
be something the user does explicitly, given the chance of personal data 
leakage or potential data loss.

If Firefox somehow inferred who I was based off my Facebook cookie and started 
doing things for me on my behalf, I would be alarmed, to say the least.

~ d
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