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This document summarizes the evolution and use of social networks in Chile from the late 1990s to present day. It describes the early popularity of sites like Fotolog in the 2000s and the launch of Facebook and Twitter in Chile in the late 2000s. It notes that during the 2010 earthquake, social media saw a 500% growth in Chilean users and became a vital source of information for finding missing people and verifying reports. The document concludes that social networks are now a trusted source of timely information that can help save lives during crises.