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More than 4 in 10 UK mobile phone subscribers (44%) belong to an online social network. And 25% of those social networkers use their mobile phone for social-networking activities, according to (pdf) Nielsen Mobile, writes MarketingCharts.

Around 812,000 Britons each month, or 1.7 percent of all UK mobile subscribers, visited a social-networking website using their mobile during the first quarter of 2008, Nielsen said.

Most Popular Social Networks on UK Mobile Phones

Facebook is the most popular site for mobile social networking, being visited by over half a million Britons (557,000) from their mobiles, or 9 percent of all UK Mobile internet subscribers.

MySpace and Bebo follow, with a combined reach of 6.0 percent of UK mobile internet subscribers.

Mobile vs. PC - How the Leading Social Networks Compare

The four most popular social networks on the mobile are also the four most popular on the PC.

Travel social network WAYN has the strongest performance on mobile, ranking 7th on mobile internet compared with 21st on PC internet.

Most Common Mobile Social-Networking-Related Activities

The most popular mobile social-networking activities are sending and receiving messages/mail.

One in five (21 percent) Britons who use their mobile for social networking activities use it to add friends.