There is a plugin for Aperture that allows you set every option there is in Flickr, including groups! It’s called FlickrExport. I don’t know if it or something like it exists for Lightroom as well, but I’d imagine so.
Though for Aperture this plugin is pretty much essential, since the built-in Flickr support is so buggy that for me it may be the single biggest flaw of Aperture.
I’m a huge Apple fan, but this is just getting ridiculous. Every IT student learns in their first(!) semester NOT to hard code stuff, but to rather use methods and variables instead. And now Apples comes along and instead of implementing a flexible API that could allow the installation of add-ins, they hard code a couple of select services into the system! This was embarrassing when they introduced it in iOS5 and it continued to be embarrassing in iOS6. I really hoped they would change to something modular with iOS7, but I guess they won’t.
Historically it becomes even more absurd: Yes, Android has a modular API for this, and so has Windows 8. But: Even OSX has had a modular API for services (called “services”, duh) for like a decade now! Ironically this new, hard coded sharing technique is being re-introduced into OSX which just makes no sense.
I still don’t understand what’s wrong with Jabber. The online/offline/unavailable stuff is a bit different from the always-on state of SMS, but just stay always connected and it’s pretty much the same thing (and even more informative with “away” indicating that you’ll receive the message but might not read it on time).
It’s open, it’s free, it’s available on pretty much every platform that ever existed. And with GTalk based on it it has a huge install base as well.