Crap. I have a huge list of starred posts that is my current TBR on here because AO3 feeds. Crap. I don't think this will do at all.
Because I'm all 'Hubzilla YAY!' and spending most of my time here I'm like, ooh, shiny tools, what can I use for this particular job?
But really, AO3 has that handy dandy Read Later list that I already use and should continue using because splitting TBR's is never a good idea.
But it's not shiny. And there's no organisational system (seriously, if there was one thing I could ask of AO3 it would be the ability to filter Read Later items).