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Just like recent post widget you can also add recent comment widget directly into yours blogger webpage ,this is a customize blogger widget and you can edit this directly from yours blogger account after adding this widget .
The most important features of this widget is that it provides you the option to display from one to more then hundred comments ,and controls number of characters to display in comments ,At present this widget is displaying 100 words, if you want to edit this you can do this from Html code after adding this widget into yours blog,