Online adspend in the USA continues to grow apace, according to latest figures from the Interactive Advertising Bureau.

A year-on-year rise of 38% in the first quarter to $3.9 billion (€3.03bn; £2.07bn), is predicted by the IAB. This represents a 6% increase from Q4 in 2005.

In Q1 2005, internet adspend rose 26% from the same period in 2004, and 4% from the previous quarter.

The IAB, via PricewaterhouseCoopers, estimates adspend for the first and third quarters, using information from the top sellers of ad space. It provides actual results for the first half and full year.

The IAB survey's numbers are drawn from companies that report "meaningful online advertising revenues". They include data from websites, commercial online services, free email providers and other companies selling online ads.

Despite the spectacular revenue rises, the internet is still dwarfed by adspend on traditional media - $125bn in 2005, according to Nielsen Monitor-Plus.

Data sourced from Adweek (USA); additional content by WARC staff