Twitter is currently testing iteration on its Fleets feature –to enable users to make
collaborative Fleets. This new option will display as a double-bubble in the Fleets section,
with contributors linked into a single stream. Upon clicking on it, followers of both the users
can see the collaborative Fleet.
This feature looks somewhat like Instagram co-streaming that is visible in the Stories bar.
Besides, Twitter is still in the phase of testing its Fleet as it is yet to be launched in all
Source: Socialmediatoday