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SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month