This is sort of the fun, I think, in maintaining things like listen and read posts on my site. While they're a useful archive for me, in some part I hope they might speed some discovery for folks who find them or search them by category/tag as well.
I could post somewhere, "Hey I listen to this podcast," or retweet a headline, but invariably in the morass of content out there, there isn't actually an indication that I invested my finite amount of time actually listening to or reading that thing. Perhaps I was just doing some social signaling to make myself seem more interesting or worldly? To me this is a lot of the value of these types of posts.