The results based on unique audience growth for the first six months of the year show that is the fastest growing website with a 478% increase in unique users.
In second place is photo sharing site with 131% growth, followed by with a 98% growth in third. British social network rival was placed in eighth place.
Despite the dominance of videosharing other sectors, particularly financial services and telecoms are also doing well. The fourth-fastest growing site is with 97% growth and in seventh is with 86% growth.
Alex Burmaster, Nielsen//NetRatings European internet analyst, said: "Last year indicated the potential for sites utilising the internet as a method for users to communicate and share information and the first half of 2006 has confirmed this.
"The audience to video sharing phenomenon YouTube is testament to this, having grown by a factor of almost five during the year, meaning that more than one in eight Britons online now visit this site."
Latest figures from Neilsen//NetRatings also show the top online brands in terms of female users, with ninth fastest growing online brand the cinema chain taking top spot, with 59% of its audience women.
In second place is Bebo, third is Vodafone and fourth MySpace while You Tube is eighth with a female audience of 36%.
Top 10 growth brands
1. YouTube 478%
2. Flickr 131%
3. MySpace 98%
4. American Express 97%
5. Photobucket 91%
6. Mozilla 91%
7. Vodafone 86%
8. Bebo 85%
9. Odeon 82%
10. B&Q 72%
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