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Issam Darwish, Founder, Singularity Investments. Credit: forbes.com

Singularity invests in mobile advertising startup Sliide Airtime

Singularity Investments announced on Wednesday that it had invested an undisclosed sum into Sliide Airtime, a mobile advertising technology start-up that gives consumers free airtime in return for engaging with news and branded content delivered to the lock screen of their mobile devices.