Earlier when digital marketing service had not come up, it was this system which worked, also called as word of mouth Marketing (WOMM, WOM marketing), differs from naturally occurring word of mouth. In that it is actively influenced or encouraged by organizations (e.g. 'seeding' a message in a networks rewarding regular consumers to engage in WOM, employing WOM 'agents'). Affiliate marketing companies and lead generation companies use this system as an effective tool for giving high return on investments. It is one of the most powerful mode of marketing even today.