By Shaykh Muqbil Ibn Haadee al-Waadi’ee

A brief word from the late Imaam of Yemen concerning how to handle the constantly spinning merry-go-round of doubts, rumours and propaganda at the hands of the those who attack the da’wah of ahlus-sunnah.

Thus, it is mandatory to expose falsehood and defend the da’wah whilst you are busy propagating the call –and all praise belongs to Allaah. However, we do not want ourselves to become preoccupied with refuting this person and that person as this is what they desire for us to do. We occupy ourselves with calling to Allaah and in the course of the sermons (khutab) or talks we refute those who are intent on hindering people from good. 

http://www.troid.org/dawah/methodology-of-da-wah/how-the-callers-to-allaah-should-respond-to-false-propaganda.html