This all boils down to what your content license allows. Most content service have very clearly the amount of domainsyou are allowed to post your pictures on. These must be on the license or they are not valid therefore your license for the content is not valid therefore its illegal.
Also many people use thumbs that "depict" someone who's age is undecernable , this is child porn in the usa. If the age of the person in the picture is not clear , regardless of the age of the person, it can be construed to be cp.
Granted most content providers wont sue you for posting thumbs on a site , but as your license is invalid if you do so, your liable.
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