I've never used Flickr and I'm concerned about privacy: can anyone tell me if one's photos are safe and not data mined (a la google) or tagged (a la Facebook)? When deleted, is it permanent? Sorry, but I've never been inclined to upload personal data, but the 1TB deal is tempting for backup etc.
You don't want to use Flickr for backup. And yes, like ALL online services, you're being data mined.
It's no secret that Yahoo wants Flickr users on the free account, enticed by the 1TB storage. The paid options are damn near buried in the interface. They WANT you on the ad based tier. Yes, when you delete a photo, it's permanent.