SAN FRANCISCO , United States (AFP) — Twitter shares nosedived Tuesday after a quarterly update showed little change in its user base and the messaging platform delivered weaker-than-expected revenue growth. The company posted a loss for the first quarter of 2016 of $80 million, compared with a loss of $162 million in the same period a year ago. Revenues meanwhile jumped 36 percent year-over-year to $595 million. But in a key metric in the fast-evolving […]