"We've been invited to Rachel and Jamie's wedding - speaking of which, did you know that they're moving to Ealing?"
An example from Cambridge Dictionary.
Is the present participle 'speaking' a dangling modifier here? If not, please explain.
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Sign up to join this community"Speaking of which," is a set phrase and an interjection or interpolated remark. It is not a dangling modifier.
It has the meaning of "with regard to or in relation to what has just been mentioned,"