I really like the idea of Particles. I had a similar thought this past year about building a news MVP that simply consisted of atomic facts (no more than a sentence) with an attached probability and discussion. Kind of like those you see in the IPCC (international panel on climate change) reports, where they have their claim and degree of certainty.
We were getting there with the whole Wikidata initiative, but it's still in its primitive stages with respect to content being statically authored and updated (AFAIK). It would be very interesting to see where we go with GraphQL - I could see that becoming the dominant machine-to-machine protocol for Semantic Web 3.0. The whole idea of taking what are usually REST resources and turning them into hierarchical JSON documents which you can query very flexibly is immediately appealing.
If this Particle concept catches on like cards have in UI design, I'd expect Twitter to be the first to ride the wave.
[1] http://www.niemanlab.org/2014/05/the-leaked-new-york-times-i...