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Re:Slack Is Going Public at a $16B Valuation by dillonmckay on Wednesday June 19, 2019 @10:19PM (#20229264)
ICQ was quite impressive in 1997.
Re:Slack Is Going Public at a $16B Valuation by crummy on Thursday June 20, 2019 @02:22AM (#20230404)
ICQ offered offline delivery, which was missing from many chat apps for a long time, too.