http://www.startupnation.com/community/orca/topic/Going-with-CPT-cost-per-time-over-CPM-for-ads.htm Going with CPT (cost per time) over CPM for ads Sat, 4 Dec 2010 0:16:00 GMT http://www.startupnation.com/community/orca/topic/Going-with-CPT-cost-per-time-over-CPM-for-ads.htm Sat, 4 Dec 2010 0:16:00 GMT http://www.startupnation.com/community/orca/topic/Going-with-CPT-cost-per-time-over-CPM-for-ads.htm#769573