Ayudame, porfavor

Here's the deal, yo. I used to use Yahoo!Photos to keep an online copy of ALL of my digital pictures. I like to have an online backup of ALL of them that I can get to at any time and email or print. I also liked the feature they had that I could email a link to family of a certain photo album - in other words, it has a really easy, private way to share the pics. Oh, the other big thing I'm looking for is that someone doesn't have to sign up as a member of the service to view my pics.

The problem is Yahoo! is closing their photos and we can choose to have them all transfered over to Flickr, Photobucket, or some other one that I forget. As far as my research can tell, none of them offer everything I'm looking for for FREE. So please tell me what you use and why you like it or if you know of one that meets all 4 requirements (access to all of my unlimited pics, easily share pics privately, others don't have to sign up to view, & FREE). Gracias.