And just to correct one other thing, the gerunds pipianda and pipiandum do not mean ‘things tweeted’ and ‘a thing tweeted’ respectively. They mean ‘things to be/worthy of being/that must be tweeted’ and ‘thing to be/etc. tweeted.’ They can also just be the notion of the verb as well, much like the infinitive as mentioned above. Romans themselves considered the use of a verb as a noun as declining thus: