
Social media platforms such as Facebook and YouTube are becoming increasingly important to the online advertising industry.
The sites, which are being used more and more on smartphones thanks to the development of apps and mobile broadband devices such as the Blackberry, account for a large percentage of user time spent online, which analysts say advertisers will be keen to cash in on.
"In the end you need to follow an audience and find out what they do all day to decide where you are going to advertise," said Guy Phillipson, chief executive at the Internet Advertising Bureau.
"Facebook, after Google, is the biggest site and of course you have Bebo and MySpace. So much of our time spent online [is] within social [networking] and that's going to be inescapable for advertisers."
Advertisers will increasingly use social media to target younger users and users of Facebook on broadband mobile phone services on devices such as iPhones.
The news comes as internet marketing firm Nielsen announced the launch of its tools to measure online brand advertising's effectiveness in the UK.