Facebook is a major social lubricant of our time, often recommending friends to add to your circle and notifying you when a friend has said or done something potentially of interest.
...a friend has said or done something potentially of interest.
of interest 作 something 的后置定语,= interesting。
原句等于说:
...a friend has said or done something potentially interesting.
【翻译】......一个朋友说了或做了一些可能很有趣的事儿。
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