Now, why is this bad? Mostly because it’s been hoisted upon everybody, and many people will not have realised, or won’t change it back one way or another. In short, it’s Facebook saying ‘we want control of all your communications, we’re going to kick out of the way anybody else’. This goes hand in hand with not being able to export your contact list, it’s Zuckerberg’s walled garden (soon turning into a prison).
What are the repercussions? Well, you can change it back to how it was. But people have reported that having the ‘Facebook Sync’ option on their phones (many Android, WP7 and iPhones have this option), it will mean that when you choose a contact to send an e-mail to, it will shoot it to their primary email address – namely their Facebook one. Which, as others report, has been known to somehow lose e-mails.
In other words, it’s a massive pain to email anybody now, your email list has been poisoned. Much easier to message them on Facebook right? Genius.
Yeah, that could be a problem. It’s clear where Facebook stands, you’re a sheepo, and you can’t leave the field, no matter what.