It sounds very plausible, from a programmer's perspective.

And yes, sorting and searching would very much need to be a layer on top of the blockchain.
OR, you just search through the entire chain for everything. (truncated of course... you hope)

So, basically building a sorted database as people access information. Is what i picture when i read "hivemind".

... i hope they are not intending to build a permanent database... the resources would get huge.

(and the only way this is not conjecture is to be sitting in Stinc and completely knowing the back end)