We've asked Facebook how it intends to resolve its issues with angry advertisers, but did not receive an immediate reply.
Unlike Facebook which bases its income on ad revenue, Telegram is funded by user donations, and includes features like encrypted end-to-end messaging. Facebook's outage spanned the globe, with reports of disruptions concentrated on the U.S. East Coast and in the United Kingdom.
Instagram users began reporting problems with the photo-sharing app shortly after Facebook seemed to go haywire. The outage prompted exasperation from business owners and individuals who rely on Facebook's platforms to communicate, and inspired a flood of derision on Twitter, where some users migrated to stay connected.
According to DownDetector.com as of March 14, there were still "problems at Facebook".
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Facebook's shares fell almost 2 percent in morning trading on Thursday.
Separately, the New York Times reported on Wednesday that US federal prosecutors were conducting a criminal investigation into data deals Facebook struck with more than 150 technology companies such as Amazon.com Inc and Apple Inc.
Facebook suggested there was nothing new in the New York Times report. "We're very sorry for the inconvenience and appreciate everyone's patience".
A spokesman for the social network said the company was cooperating with investigators in multiple federal probes, without addressing the grand jury inquiry specifically. "As a result, many people had difficulty accessing our apps and services", a Facebook spokesperson said Thursday.
Facebook has maintained that it shared limited amounts of user data with smartphone makers and other outside partners to enable its services to work well on devices or with applications. The interruption also affected gameplay for owners of Oculus VR headsets, a company that Facebook bought in 2014.