I just saw news about a new experimental web and Android app called Keen, developed as part of Google's Area120 workshop:
The idea behind the app is to support content curation along the lines of Pinterest with Google search and machine learning to provide the best results. Basically, you start by defining a topic or interest that you want to learn more about (the app suggests phrases such as “Go backpacking in Porcini” or “Start a small truffle business”), then narrow down that interest by adding a few Google searches to get you started.
From the list of articles suggested, you can save those you want to read as "gems", which supposedly leads to better results in the future. You can also add own links or text notes, and organize all your gems into sections.
Last but not least, it is also possible to invite collaborators to your collection, or even make it fully public.
There's some overlap with Cake's modus operandi, but I don't see Keen as a competitor that takes away from stuff happening here, more like something that could actually support Cake (and be supported by Cake), because Keen currently doesn't offer a way to have conversations. I added an appropriate Cake topic to a collection I started, and was immediately suggested further conversations from that topic. Think about what this could do for Cake if some of you started public collections that - among other things, of course - contained links to Cake conversations.
(Hint: the blog post contains a way to contact the team to suggest a public collection you created.)
Caveat: as is always the case with Google, and especially with their experimental products, all of this might cease to exist at any point in the future. Still no reason to not at least give it a try.