Is it permissible to use pictures of faces of foreign men (who are not actors or singers, and may be in black and white) as profile pictures on Facebook and Twitter, even though there is no intention of causing fitna?

It is not permissible for the questioner (sister) to use pictures of non-mahram men as her profile pictures on the Internet, even if it is said that pictures of living beings are not forbidden. This is due to the corruption and dangers that arise from such an act, related to the mixing of genders. She can use other pictures that are not of men, and even not of living beings.