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In page List of Facebook features:
"In March 2017, Facebook extended live-streaming support to PCs.[11][12] In May, Facebook Live was updated on iOS to let two users livestream together,[13] and the following month, Facebook added support for closed captioning to live video. This is limited to the CEA-608 standard, a notable difference from the automatic closed captioning available for Page videos that are recorded and then uploaded, due to difficulties in adapting the same standard at scale on the low-latency real-time nature for live content.[14][15]
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