I'd like to know whether "about" or "just about" should be used in the following. If either is fine, what is the difference?
Jack London was immensely popular about / just about a century ago.
I'd appreciate your help.
About means approximately, or close to.
On the other hand, just about is generally used in the following context:
He was good at just about everything; a jack of all trades!
(Mostly, just think that you can replace "just about" with "basically.")
Specifically, in your example, the best term to use would be "about," and as a general rule of thumb, mentioning an approximate time period uses "about."