In my experience, SnapChat isn’t a particularly useful medium for businesses. Most users of SnapChat use it as a disposable image-messaging type service. The few who gain any kind of following to their “story” are doing so with really funny, or really engaging content. Most businesses don’t have the constant activity required to facilitate this, and I doubt that most businesses would be comfortable with employees regularly sending snaps out that would vanish, unable to be later reviewed.
Most businesses want more than a fleeting impression - they want posts, articles, etc that will last for longer than that. Twitter is the most borderline thing there, but even that has a history.
That’s just my opinion, though - I’m sure there are people who would disagree.