Indirect methods and systems for gaining valuable address data and increasing customer's loyalty:
Even in this context the assessment and evaluation of those service-oriented web-pages is not made emphasizing and according to the revenue gained but by viewing the size of the community which uses this system.
The purchase of youtobe (which is a free of charge portal for storing, sharing and viewing videos) by google for the amount of 1,600,000,000 US$ is showing which potentials can be reached.