Mobile was a serious weak point for Facebook when it went public, but it does not appear to be for Twitter. In the three months from April to June, 75 percent of Twitter's average monthly active users accessed the service from phones and tablets, and more than 65 percent of its ad revenue came from mobile.
The big ones are obvious, like Facebook (which got nine mentions in the filing), Google, LinkedIn, Microsoft and Yahoo. But Twitter also listed local rivals it will have to battle internationally: China's Sina Weibo, Japan's Line and South Korea's Kakao.
Companies have to disclose the major risks to their business when they go public; Twitter's went on for 31 pages. Among them: failure to grow its user base, loss of ad revenue, competitors, failure to expand internationally, technical problems, government restrictions on its service (it's blocked in China), and bad publicity
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