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Wearable Ubiquitous Technol."],"published-print":{"date-parts":[[2017,9,11]]},"abstract":"<jats:p>Accessing online social networks in situations with intermittent Internet connectivity is a challenge. We have designed a context-aware mobile system to enable efficient offline access to online social media by prefetching, caching and disseminating content opportunistically when signal availability is detected. This system can measure, crowdsense and predict network characteristics, and then use these predictions of mobile network signal to schedule cellular access or device-to-device (D2D) communication. We propose several opportunistic optimization schemes to enhance controlled crowdsensing, resource constrained mobile prefetch, and D2D transmissions impacted by individual selfishness. 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