There are now over 40 well used virtual social worlds online all of which are gathering pace it would seem with usage.
If you don't know what I am on about when talking about a virtual social world and want to get a glimse of many of them then see this recently published video by Gary Hayes - 2008 METAVERSE TOUR - THE SOCIAL VIRTUAL WORLD'S A STAGE
Where is this all leading? Well who knows exactly, but I do recon that at some stage it will become more attractive (for certain things) to visit the virtual place than the real place (travel costs, global warming, environmental, overcrowding, safety, been to most places).
One day a travel company (not as we know it) will offer a virtual travel experience?