Photo: XNY/Star Max/GC Images How often should someone post on Instagram? Once a day? A few times per week? Only when something new and notable happens? Fans of Justin Bieber know all too well the pain and glory of watching their fave post several times in a day — with a notable stretch in 2017 where he posted 25 times in an hour . While the singer’s haphazard approach to Instagram may once have been a charming quirk that let an adoring public know that it was really him and not a social-media

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