Favstar gets even better if you sign in.
Switched from Flickr to Instagram as my default workflow for share-to-Twitter+Facebook from my phone after the 14th step in the Flickr app.
I skipped Mavericks. The multi-monitor support in Yosemite (and maybe also in Mavericks), in itself, is worth the upgrade. Way better.
A geek who strives to change the world making it a better place for all... =)