StockTwits, for example, is an online community of investors where users sign in with their Twitter account to keep track of stock-related news.
举例来说，StockT wits，一个可以用t witter用户名登陆的在线社区，投资者可以在上面追踪与股票有关的新闻。
Facebook terms of service require people to be at least 13 years old to be members of the online community, which boasts more than a half-billion users.
脸书的服务条款要求其在线社区成员必须在13岁以上，其注册用户已超过5亿。
Facebook terms of service require people to be at least 13 years old to be members of the online community, which boasts more than a half-billion users.
脸书的服务条款要求其在线社区成员必须在13岁以上，其注册用户已超过5亿。
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