The phrase "acquaintance circle" is correct and usable in written English.
It can be used to refer to a group of people with whom one is familiar but not necessarily close friends.
Example: "In my acquaintance circle, I have met many interesting individuals from various backgrounds."
Alternatives: "social circle" or "network of acquaintances".
We calculated that 79% of the backers were from outside of our family-friends-colleagues-acquaintances circles, and they contributed 58% of the pledges.
And if there's an acquaintance in your circle who always calms you down, seek him out.
This movie follows Pierre around Paris as he visits acquaintances in his circle of johns and hustlers, has sessions with an obtuse psychiatrist and remembers how the family of his longtime sugar daddy closed ranks and shut Pierre out of his inheritance.
In this engaging biography, Holden stresses Hunt's abilities as a networker, arguing that he gathered the "widest circle of acquaintance" in nineteenth-century English letters.
It seems to me that many men don't view females outside their immediate family circle or acquaintance as "equal, valuable or of high moral standing".
Given the high incidence of cancer in my circle of acquaintance, "why not me?" might have been a more predictable question.
In these recollections, Mr. Schlesinger described such a far-reaching circle of acquaintance that it ranged from Reinhold Niebuhr to Mick Jagger, from Gina Lollobrigida to the children of Franklin and Eleanor Roosevelt.
What's strange is that, despite his camera's studied distance from its subjects — friends in Tillman's circle of acquaintance or landscapes, or rumpled clothing — his pictures read as very personal statements: Here are the people and the things I like and this is the way I like to see them.
Those who know him -- and it is a wide circle of acquaintance, encompassing architects, designers, artists, collectors, rock stars, hotel and restaurant owners and magazine writers with whom he maintains a nearly constant dialogue -- wouldn't call him a decorator, but that doesn't mean they have a better word at hand.
They also dedicate time to widening their circles of acquaintance and influence, whether through business organizations, LinkedIn or groups that attract ambitious, entrepreneurial minds, such as the Chicago Lean Startup Circle, a high-tech hub.
