I'm ex-FB and have it on good authority that this is indeed used to improve the relevance of friend suggestions (i.e. distinguish between your best friends and

I'm ex-FB and have it on good authority that this is indeed used to improve the relevance of friend suggestions (i.e. distinguish between your best friends and the plumber in your contacts). I'm also told it's opt-in, and the app dialog (not just the system dialog) does say call logs will be scraped. But still, IMO it's an incredibly invasive, incredibly dumb thing to be doing in the current context for the small benefit it brings. I hope they wake the f* up to just how bad it makes FB look like to the outside world, and kill this feature with fire.