And I do remember that Alexis, before her time at META, knew about POET.

There was a video posted quite some months ago, where she met with some other people discussing the future of photonics and talking something to the effect of "... and a little bit of POET...."

She said something very similar to the above. Listening to the whole video, POET could fit quite well.

And Mazan mentioned here that he is still betting that POET is somehow involved with Facebook/META.