The cosy commercial partnership of strong cloud competitors.
The web merchant spent $157.7 million on Google ads in 2013, over $70 million more than its nearest rival, according to a report on Ad Age, which was according to information gathered by analytics firm AdGooroo.
Amazon spends vigorously in order to ensure its adverts appear alongside key product terms, making certain that it is the first result to appear on searches for hot-ticket items.
Although it has its own online search engine, Microsoft was still the fifth biggest spender on Google ads, splashing out $67.1 million in 2013. Similarly, Yahoo was in 19th place with an outlay of $36.2 million.
Tech firms are few and far between in the ranking of the top 25 spenders, with the list mainly dominated by travel companies, telecoms firms and general retailers.
However, the research does not include results from Google Shopping, nor mobile advertising, where tech firms are perhaps very likely to push their wares.