Twitter pilots a new tool to fight disinformation, Apple brings celebrity-guided walks to the Apple Watch and Clubhouses raises funding. This is your Daily Crunch for January 25, 2021. The big story: Twitter unveils Birdwatch Twitter launched a new product today that it says will offer “a community-based approach to misinformation.” With Birdwatch, users will be able to flag tweets that they find misleading, write notes to add context to those tweets and rate the notes written by others. This is supposed to be a complement to the existing system…