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You have people who purely perform pro SEO work for their company's sites and people who actually work for and/or run SEO companies. Additionally, you have people who do everything for their own sites, including SEO. Many of these people do not release public information that states this type of work.
So, if you want some sort of super inaccurate number, check out some directory/yellow pages sites in each country that list companies who offer these types of services.
fathom, is there a sound if there's one hand clapping in the middle of the desert with no one close enough to hear it? If there are clouds, is the whole sky still blue or just the part that's unobscured from view by the clouds.
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fathom, is there a sound if there's one hand clapping in the middle of the desert with no one close enough to hear it?
Although I don't believe you actually can clap with "only one hand", the flow of air rushing passed the hand surfaces as it move will resonate air waves which would create some small amount of sound (although at a frequency normally higher than the human ear can hear). So I say yes!
If there are clouds, is the whole sky still blue or just the part that's unobscured from view by the clouds.
Actually the sky in transparent and only reflecting the colors of the visible light spectrum.
If you can see in the infrared to ultraviolet spectrum the sky would take on shades of red and purple.
That would be cool, eh!