朋友為成功社交生活不可或缺的一環。雖然保有舊有的朋友相當重要，但結識新的朋友更能為生活帶來新鮮感。在過去幾年，交友軟體（或稱：約會軟體）已經大幅度地改變了人們結識新朋友的行為。然而大部分的交友軟體的推薦機制大多仰賴地緣關係，而缺乏社群網絡上的資訊。但是，日常生活中最常見的交友方式便是透過朋友推薦及介紹。本篇論文首先對大眾進行了調查，了解「介紹朋友」的相關行為，並且實作一個利用現有朋友認識新朋友的交友軟體。

One can not have a successful social life without friends. While keeping in touch with old friends is essential, making new friends will certainly enrich one's social life. In the past few years, friend-making apps or dating apps have significantly changed the behaviors of meeting new people and making new friends. However, most of them mainly leverage on geospatial networking without much information from the existing social network of the app users. Friends lead to friends, one of the most natural way to make new friends is connecting with friends of existing friends. In this paper, we conducted a pilot survey on how people practice this “referring” behavior and further implement an application to validate the results.

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