What is the ruling on profiting from websites similar to Facebook or Arabic websites that pay for publishing, knowing that these websites profit from AdSense ads which may contain prohibited advertisements, and does the ruling differ if the owner of the website holds a permissible governmental job and his earnings are mixed?

"There is no prohibition in dealing with someone whose wealth is a mixture of lawful and unlawful. It is permissible to engage in dealings with him concerning what is lawful and to benefit from what he gives. Muslims have traded with disbelievers through buying and selling, even though the disbelievers do not refrain from usury. This is evidenced by the Prophet, peace and blessings be upon him, buying food from a Jew."