It can be inferred from paragraph 3 that which one is NOT the reason why Facebook monitors Wechat closely? ( )

参考解析：

推断题。根据题干定位到第三段第二句“It is this status as a hub for all internet activity, and as a platform through which users find their way to other services, that inspires Silicon Valley firms, including Facebook, to monitor WeChat closely.”由此可知，通过微信这个平台，用户可以享受其他服务，故A选项是原因之一; 根据本段首句风险投资家对微信的评价“WeChat is there “at every point of your daily contact with the world, from morning until night””可知，微信是成功的，人们的生活无时无刻都离不开它，故B和D都是原因。C选项“微信比脸书更好”文中并没有将两者进行比较，故本题正确答案选C。