For example , the SLIPPcat advertising system encourages companies to provide content in Second Life which can not only be obtained for free .
Which generates income for Second Life 's owner by displaying advertisements to other users when clicked ( 1 ) .
For example , the SLIPPcat advertising system encourages companies to provide content in Second Life which can not only be obtained for free but which generates income for its owner by displaying advertisements to other users when clicked ( 1 ) .