social media stream / real-time traffic measurements / traffic systems / change-detection algorithms / stochastic systems / Social media / anomaly detection algorithm / real-time information management systems / mission critical applications / human transportation patterns / social media data / social media streams / data mining / social media reports / change detection algorithm / natural language processing / prior social media messages / detection algorithm / et al. leverage social media content / social media sources / k-nearest neighbour algorithm / smartphone navigation services / anomolous event detection algorithm / /