【中文版】

阿里投资陌陌的原因可以从多个方面来解释。首先，社交领域一直是互联网巨头们争夺的焦点，而陌陌作为一款颇受欢迎的社交软件，拥有庞大的用户群体和较高的用户粘性，可以为阿里带来丰富的用户资源和流量。其次，阿里一直致力于打造一个完整的生态系统，而社交是其中不可或缺的一环。通过投资陌陌，阿里可以进一步扩大自己在社交领域的布局，完善自己的生态系统。此外，陌陌在移动社交领域有着不俗的表现，阿里投资陌陌也可以为其带来更多的合作机会和商业模式的可能性。

总的来说，阿里投资陌陌是为了进一步巩固自己在社交领域的地位，扩大用户资源和流量，以及完善自己的生态系统。这些原因共同推动了阿里的投资决策。

【英文版】

The reason why Alibaba invested in Momo can be explained from multiple aspects. Firstly, the social media industry has always been a focus of competition among Internet giants. As a popular social software, Momo has a huge user base and high user stickiness, which can bring Alibaba a wealth of user resources and traffic. Secondly, Alibaba has been committed to building a complete ecosystem, and social media is an indispensable part of it. By investing in Momo, Alibaba can further expand its layout in the social media field and improve its ecosystem. In addition, Momo has shown excellent performance in the mobile social media field, and Alibaba's investment in Momo can also bring more cooperation opportunities and possibilities for business models.

Overall, Alibaba invested in Momo to further consolidate its position in the social media field, expand user resources and traffic, and improve its ecosystem. These reasons jointly drove Alibaba's investment decision.