Yup. CMC tries to account for this in its pricing (which is volume-weighted btw) by ignoring those exchanges (which it discloses in the "Markets" section).
Even if FB/Instagram knows my wife and I share an IP address or there were both FB/Instagram and Google cookies on the same browser where I searched for Meow Mix, how would Instagram know my Google/Youtube history?
If you're an independent contractor, you'll pay a 15% rate on your income. 15%.
Also: "those earning less than $48,400 will experience an annual tax cut of less than $400, while those earning in excess of $700,000 will walk away with an average of an extra $215,000 per year." (That's probably assuming the 700k is from business interests, not salary)