What online services do you use to host and share photos?

Services like Facebook, Instagram, Google Photos, iCloud Photo Sharing, Flickr, SmugMug, 500px, and more are available for hosting and sharing photos online. I'm curious what service, or set of services, you you use and how you decided. Do you cross post between them, and if so what strategy do you use?

I'm currently spread a bit and without much cross-posting between Facebook, Instagram, and Flickr. Not a strong conscious decision, though I've been wanting to do a bit more photography and would like to figure out a better strategy.

I think some key points to consider are cost (free vs pro, ease of upgrade/downgrade), storage space and restrictions (total space, max individual size, filetypes, enforced resizing/compression), ease and control of sharing publicly or privately, network audience and reach, and creative rights (who owns what rights on the content)

This Terms of Service; Didn't Read site can be helpful for at least determining what the general rights on these services are with some broad judgement.