社会性软件，或作社区性软件、社交软件，是指任何支持群体交流的软件。推动社会性软件发展的原动力明显区别于传统的交互过程。

社会性软件指的是网络上的一些软件，这些软件让用户能够在网络上和他人交互并分享信息。这类的CMC工具当中有一些网站（例如Myspace、Facebook、Flickr和Youtube）目前相当受欢迎，它们通常都具备开放API、服务导向的设计以及上传数据和媒体的能力。

再更具体的名称合作性软件运用于数据分享系统，他通常只在能使用合作功能的软件上运用。并能在社会，信任，及合作性项目之中卓越。社会性技术和沟通的技术被用于特定的网络中心组织，还被用在描述知识创作以及保存完整的协同写作。学习构成主义的理论家们像是Vygotsky、Leidner和Jarvenpaa都认为传递知识的过程有助于创作而且交谈也有助于知识的精进。

Social software, also known as Web 2.0 applications or social apps, include communication tools and interactive tools often based on the Internet. Communication tools typically handle the capturing, storing and presentation of communication, usually written but increasingly including audio and video as well. Interactive tools handle mediated interactions between a pair or group of users. They focus on establishing and maintaining a connection among users, facilitating the mechanics of conversation and talk. Although we do not have a generally accepted definition but by social software we mean software that makes collaborative behaviour, the organisation and moulding of communities, self-expression, social interaction and feedback possible for individuals. Another important element of existing definition of "social software" is that it allows structured mediation of opinion between people, in a centralized or self-regulating manner. The most improved area for social software is that Web 2.0 applications can all promote cooperation between people and the creation of online communities more than ever before.