Jack Dorsey says he is focused on "improving the health of the public conversation on Twitter". His shareholders may not be so enthusiastic about that goal. On Friday the microblogging site reported that its closely watched monthly user tally fell from 336-million to 335-million over the course of the second quarter. Mr Dorsey, co-founder and CEO, said the site was taking serious efforts to weed out fake, abusive, and "spammy" accounts. Twitter shares fell nearly a fifth. It has been a rough earnings season for the social media and subscriber based tech stars such as Netflix, Facebook and now, Twitter. Each has a distinct approach to profitability. But the companies’ investor bases have been most animated by growing their scale in the hopes of sustained high earnings one day. This month Wall Street found out that — either due to saturation, fatigue or scandal — the limits of easy user gains are approaching faster than expected. Twitter’s overall scale has been a disappointment for a...

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