Justin Bieber's Manager Scott Braun Just Arrested in Long Island, NY

TMZ has learned Justin Bieber's manager turned himself in to police this morning -- and it's all over unlawful Tweets ... allegedly.

Scott "Scooter" Braun surrendered on two misdemeanor charges -- Reckless endangerment and criminal nuisance -- stemming from an incident at a mall in November.

The incident which triggered the matter occurred last November at the Roosevelt Field mall when fans got