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The internet now accounts for a quarter of all advertising spending in the UK, according to figures.
They show that the value of online advertising grew by 12.8% in 2010, breaking through the £4bn barrier.
A study by the Internet Advertising Bureau (IAB) and the accountants PwC found that online advertising spending grew three times as rapidly as in 2009.
The biggest growth area was display advertising on social networks, which grew by nearly 200%.