The top 10 theory pages visited for 2014 (with across-site percentages):[1]
Institutional theory (9.4%)
Social network theory (6.7%)
Contingency theory (6.6%)
Organizational culture theory (5.8%)
Transaction cost economics (5.6%)
DeLone and McLean IS success model (5.1%)
Technology acceptance model (5.1%)
Socio-technical theory (4.8%)
Garbage can theory (4.0%)
Diffusion of innovations theory (3.7%)
+infos: http://is.theorizeit.org/wiki/Top_10_IS_Theories_2014