The worthiness of a digital application (apps) for one user to share with another, with
interaction between users mandatory for
functionality of the app or one of its features. Different from virality, where one user simply passes on
information from one source to another user with no interaction required between users whatsoever (sharing a link or image, etc.), however, both measure success with higher numbers from simple seeding(one user shares with others and those new users share with even more, newer users, and so on).
The "sharability"
factor of that sports app, SpeedBrackets, is huge, because it requires users to form their own contests with their
friends and families, co-workers, and even
customers for business owners.