Google Analytics lets you measure your advertising ROI as well as track your Flash, video, and social networking sites and applications.
Google analytics + GoConvert
Use GoConvert and Google analytics to maximize the ROI of your sales and marketing spending. Enrich information in your Google analytics account, improve contact and deal information, and start visualizing marketing and sales performance. GoConvert works around the clock to automatically fill in missing data. Your insights get better all the time.