价值中国网即将升级的“关系人”网络，将“关系人限制在真实的同事、同学、合作伙伴、或者熟悉的朋友圈子内。因此加“关系人”时，要事先知道对方的email 地址。
有限制才有价值，然而，“这个世界很小”，只要通过最多6度（有效的应当在3度以内）就可以联络到这个世界上的任何一个人。
In Ryze, to add someone as a friend takes a single click, and you get no opportunity to say why someone should join your network. Though that makes it easier to add people, on the receiving side one can end up with a number of people who wanted to add him as a friend when he has no idea who they were.
An important strength and weakness to LinkedIn is that it is much more protective of your privacy. （Linkedin的一个重要的优点和缺点，就是充分保护用户的个人隐私）You can't add anyone to your network unless you know their name and email address, or you have to get a referral from someone who is already your friend. （你如果不知道某个人的真实姓名和邮箱地址，你不可能将他/她加为”关系人”；除非通过某个你们共同的朋友，在线介绍。）
The person you want to have as a connection should also confirm your connection request. In LinkedIn, you can’t even access members, who are further than some number (4) of connection levels away from you. This reduces the possibility of the unwanted contact, but at the same time, it reduces an opportunity for social contacts between any two members.（每一个＂关系人＂链接请求，必须经过对方的同意。在Linkedin网站，你甚至无法接触到4度（即：朋友的朋友的朋友的朋友）以外的“关系人”。这避免了一些不必要的接触和打扰，当然，也降低了任意两个人之间的连接机会（不过，能够真正开发到3度的朋友，已经可以发展出巨大的社交网络了。））
In another business network, OpenBC, you can specify a reason why you want to add a person as a contact.More importantly, your connection to this person become “serious” (i.e. are taken into account by calculation of your status) only if he or she also added you to his contacts.
In Ryze and Friendster, when you request to add someone you don't get an opportunity to include in the request message who you are and why you wanted them to join your network. Tribe however, does allow you to personalize your request to join.