Wechat serves as a media platform for people to share their thoughts.
这句话为什么不是被动语态,is served as呢?微博不是被提供给人们嘛?
serve as ...表示“当......用”的意思时,serve 是不及物动词,只能用于主动语态。例如:This sofa serves as a bed . 这沙发可当床用。