Question Summary:
in regards 2 making duaa in a group behind the imam after salah , could you please explain the daleel behind doing this because many people are of the opinion that this is a bid’ah

Question Detail:

in regards 2 making duaa in a group behind the imam after salah , could you please explain the daleel behind doing this because many people are of the opinion that this is a bid'ah

Answer :

In the name of Allah, Most Gracious, Most Merciful

Assalaamu `alaykum waRahmatullahi Wabarakatuh
 
The question has been answered in detail. Please see the link below:
http://www.al-inaam.com/fataawa/dua_hands.htm
 
Wassalamu Alaykum