Google is poised to rake in a colossal $38.6 billion in online advertising revenues in 2013, equating to a third of all revenues tallied from the ten biggest online advertisers, which is expected to reach a total of some $117.6 billion in 2013, up from $104 billion last year.

Twitter ranks ninth amongst the top online advertisers, with its estimated $600 million in online ad revenues this year accounting for just a half percent share of the overall market.

Twitter, however, is on track to earn more this year in online ads than LinkedIn ($400 million), although significantly less than Facebook ($6.4 billion).

Yahoo ($3.5 billion) and Microsoft ($2.9 billion) also feature strongly in the chart.

(Source: Statistica.)