Stacey123 - yeah it is annoying, as it basically means we can't use Facebook with our phones anymore (each time I log in it automatically re-adds my account to the auto-synch list and the problem starts anew). But at least I can actually phone people again.
Facebook itself doesn't seem to be at the heart of the problem, though, because it always worked fine before, and even if I revert to the factory version the problem remains. It looks like it's something that's recently been added to either Contacts itself, or possibly an Android update, that has made these two applications incompatible.
Josue1018, Marisa_Amaral and anch - have you tried Settings > Accounts & synch > disabling auto-synch and removing all accounts (make sure you're logged out of Facebook), as well as uninstalling WhatApp, disabling auto-update in GooglePlay settings and reverting all Google apps to their factory versions? (Settings > Applications > Manage Applications > go through all Google and Facebook related apps and "uninstall updates") If you've added something else that uses contact info, try uninstalling that too.
eta: Also, I'd be interested to know if this problem is exclusive to Xperia users, or is other Android phones are experiencing a similar thing. Does anybody have access to, or know somebody with, a Samsung or HTC phone that's suffering from the same thing?
