Traditional instructor-led training is seen as "push learning" that can be boring, while modern learning is becoming more blended, social, and community-driven. Learning management systems must incorporate mobile accessibility and social elements to engage users, otherwise they risk becoming unused. Pull learning, where learners have freedom and access learning anywhere anytime, is becoming more relevant as employees constantly use social tools and mobile devices for learning. Gartner research predicts over 1.6 billion mobile devices will be in use by 2013.