ANSWER: If by endorsing such products you are asking the people to go and check their sites with all them models on it, this is not permissible as you are collaborating with them on their evils and vice. 

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ANSWER: No problem in putting such photos of living scholars though I do not like it nor recommend it.

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ANSWER: This is not haram but its not recommended due to the possibility of catching evil eye.

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ANSWER: If she is of the same gender as you and she allows you to watch her page and it is halal what she is posting, this is permissible. But if she is posting haram photos or you are not a female, this is prohibited even if she permits you.

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