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.