The team behind Hypothesis, an open-source software tool that allows people to annotate web pages, announced in March that its users had collectively posted more than 5 million comments across the scholarly web since the tool was launched in 2011. That’s up from about 220,000 total comments in 2015 (see ‘Comment counts’). The company has grown from 26,000 registered users to 215,000 over the same period.

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