透過社群網站的聯繫，我們和許多已熟識但久未聯繫的朋友搭上了線，也和朋友的朋友產生互動，網路上的社交活動擴展了交友的邊界。然而這也帶出了新的問題，親戚朋友們很容易在社群網站上搜尋你，將親戚朋友加入與否，成為一種兩難的決策。加入會使得不同的朋友圈混雜在一起，交換一些其實你並不想外傳的資訊；不加入也會使得原本的朋友感覺你並未將其認定為好友圈，進而造成實體社交上的交情裂痕。不管從哪個方向來看，網路上的社群實際上反應出了個人實體社交網路的一部分，而實體社交網路的關係也影響了網路上的社群網站內的社交活動。
本研究將探討隨著網路快速發展，社群網站打破了傳統實體社交上受限於時間與空間的區隔之後，人們為何會刻意的選擇拒絕加入好友圈，不讓網路上的人際網絡一直延伸。以計劃行為理論探討影響實體社交活動的因素如人際界限認知、知覺風險與關係品質認知等三大構面對社群網站中之交友行為影響。結論歸納如下。
1. 關係品質認知對交友意圖有顯著的影響
2. 知覺風險對交友意圖有顯著的影響
3. 人際界限認知交友意圖有顯著的影響
其中以知覺風險的影響效果為最大。
關鍵字：社群網站；人際界限認知；知覺風險；關係品質認知

Through Social network sites, we make contact with familiar but long-lost friends and interact with friend's friends, social activities on the network extends the boundaries of friends. However, this also brings new problems, friends and relatives can easily find you in the social network sites, to add relatives and friends or not, is a decision-making dilemma. If added, the friends circle will be mixed and confidential information will be spread. If reject, will make friends feel that you have not identify as friend and cause cracks in the friendship of social entity. Regardless of the direction from which point of view, the social network sites reflect the real value of the individual entities on the social networking. The relationship of social network entity also affects the activities of social network sites.
With the fast development of Internet, the social network sites break the limited of time and space, this research will explore why people would deliberately choose to refuse to join Friends Circle, refused to let people network keep extending. To explore the factors that affects the real social activities by Theory of planned behavior such as Interpersonal Boundaries, Perceived Risk and Relationship Quality etc. Three dimensions affect the behavior of making friend in the social network sites
Summarized as follows
1. The Relationship Qualities have a significant affect on Intention to make friends.
2. The Perceived Risks have a significant affect on Intention to make friends.
3. Interpersonal boundaries have a significant affect on Intention to make friends.
Key words：Social Network Sites；Relationship Qualities；Perceived Risks；Interpersonal Boundaries.

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