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					Originally Posted by  Top100EbooksRank
					 
				 
				search:  Google (nearest competitor is?) 
video:  Youtube (nearest competitor is?) 
social networking: Facebook (nearest competitor is?) 
music:  Apple Itunes (nearest competitor is?) 
face to face video:  Skype (nearest competitor is?) 
auctions: Ebay (nearest competitor is?) 
retail: Amazon (nearest competitor is?) 
			
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Search:  Yahoo, Bing.
Video:  Vimeo, UStream
Social: Twitter, LinkedIn
Music: Amazon, Pandora, Naptster
Videochat: Google Talk, Facetime 
For auctions, others have tried but eBay certainly seems to be a runaway.
retail:  Everyone else under the sun, including Walmart, and Buy.com
Being the most popular, or even the biggest, doesn't make you a monopoly, in any way, shape or form.
eBay is the only example in the list that I can't think of any viable competition for.