A thread on twitter which has lost all relevance and/or interest, or where only idiots trying to look cool after the main trend remain to show any form of willingful continuation of the thread. Can also be applied to forums and blogs. Another way of these coming about is where a shitter thread is created as a means for procrastination
have you seen the kinds of things people are tweeting on twitter nowadays? It's all shitter threads
The continued tweeting about Micheal Jackson's death and the current tweeting about Justin Bieber are examples of shitter threads.