The main types of social networking services are those that contain category pla
The main types of social networking services are those that contain category places (such as former school year or classmates), means to connect with friends (usually with self-description pages), and a recommendation system linked to （） .
A.net
B.interests
C.others
D.trust
正确答案：D解析：主流类型的社交网络通常包含一些诸如校友或同学等分类的场所，这些朋友通常会有自我介绍，而且社交网络也是一种基于（）关系的推荐系统A、网络B、兴趣C、其它D、信任
词条内容仅供参考，如果您需要解决具体问题
（尤其在法律、医学等领域），建议您咨询相关领域专业人士。