An asymmetric follow social network is one which allows many people to follow an individual or account without having to follow them back.
[1] It is also known as asynchronous follow[2] or sometimes asymmetric friendship.
[3] Asymmetric follow is a common pattern on Twitter, where someone may have thousands of followers, but themselves follow few (or no) accounts.
[4][1] In September 2010 Facebook started experimenting with a similar feature, which Facebook calls "Subscribe To.
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