Flickr was the best photo site, not perfect, just the best. If you are a Pro customer $29/year it was unlimited. But they've been changing the interface to be tablet friendly and they have made it difficult to use and manage. It's broken in many areas and they are still changing it weekly. Very frustrating. And users have lost quick ways to access favorites, and links.
But it's now free with 1 terabyte of storage. I haven't had to deal with the ads yet, since I'm a Pro Account owner, but given the silly changes I will not be renewing.
Flickr has a big following and a lot of third party apps.

But what do you expect for free? Beggars can't be choosers.

Gmail offers 15 Gigs free to Google Drive per account. I wonder if there is an 'app' to exploit that. Or do we have to access Picasa Web?