Why do you search for images? Image search is always quoted as the second largest search area next to web search. How big is the market? According to Quancast, unique visitors to images.google.com in the USA is 32 million, while unique visitors to google.com in the USA is 142 million. Since YouTube does not use Google subdomain, her data is not included in the list. YouTube has 85 million unique visitors in the USA, so Google images are the fourth largest Google product after google search, maps and YouTube.
32 million is a huge number and what do these users search at image search? I don't have a figure of Google, but according to Laurie Sullivan's blog, Todd Schwartz, group product manager of online services division for Bing at Microsoft mentioned that '40% of the overall image queries are related to commercial searches, such as travel and shopping, Microsoft found that another 44% of the searches for images related to science and nature and fashion, as well as tattoos. The remainder of searches related to entertainment, from movies and television to video games and celebrities.'
Image search Queries to the Bing
40% commercial searches, such as travel and shopping
44% science and nature and fashion, as well as tattoos
16% entertainment, from movies and television to video games and celebrities
It's interesting that not a few queries are related to science and nature. Is it because it's easy to understand science visually? It's also an eye-opening fact that people search for tattoos, although it may be easy to search for tattoo by image itself rather than by keyword.
Above data is that of image search by keyword. The number of Search by upload image is largest search queries at GazoPa. I'm not sure that the trend at GazoPa is same or similar to the keyword search. I'd like to share the figure of GazoPa in future.