Flickr is an excellent photo hosting service that provides each photo with a unique (and thus postable) URL, has the support of a large number of apps including native iPad/iPhone support, and it gives you a ton of space for free. It's one of the services I use, and the one I use to host the images I post here.
[OT] By the way, for those of you who have a decent number of photos (of golf courses or anything else) I cannot recommend Google Photos highly enough. It allows unlimited uploads at high resolution, can be set to automatically upload new photos, has an outstanding app that allows you to search your own photo collection using google's excellent algorithm (so you can search your photos for something like "dogs" or "beaches" or "Bob" and it will pull up all the photos that correspond), and it's all free. Even if you don't use the features, it's wonderful as a redundant offsite backup for your images. An absolute must have for anyone with photos they care about, in my opinion.[/OT]