Recent evidence has shown that direct provision of agricultural training to selected individuals as knowledge injection points (IPs) can help to implement a farmer to farmer extension approach. This study systematically assesses the determinants of information exchange links between trained IPs and their neighbors and the subsequent effect on awareness, knowledge, and adoption of improved varieties of maize and groundnuts and conservation farming. Using a panel dataset from northern Uganda, results of econometric analysis showed that ‘proximity’ in terms of sex, education, assets, and cultivated land, influenced information exchange links. Information exchange links increased awareness and knowledge for all the technologies, and adoption of maize varieties. Selection criterion for IPs, therefore, matters and considering ‘proximity’ between IPs and other farmers is important in designing farmer to farmer extension programs.