The expressions are almost semantically equal safe for the fact that TALK ABOUT sounds a little more purposeful than TALK OF.I think you talk of something by,sometimes,merely making mention of that thing but when you TALK ABOUT,it sounds like a real discussion....eg...Let us TALK ABOUT love(discuss somewhat elaborately).There are countries with abundant human resourses,TALK OF China,India etc.
Talking about human rights violation,China is a prominent figure.Talking of(mentioning) human rights violators,China leads the chart

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