Final answer:
Option A best supports the concept of democratization of social media by showing how social media empowers underrepresented groups, like women, to lead social change and become more visible despite mainstream media's tendencies to marginalize them.
Step-by-step explanation:
The detail from paragraphs 22-25 that best supports the concept of the "democratization" of social media mentioned in paragraph 22 is option A: "mainstream media and institutions tend to invisibilize women, Howard says, the truth is getting more and more difficult to ignore as these women so visibly lead the charge." This statement highlights how social media allows underrepresented groups to become more visible and influential, a key aspect of democratization. The 'visible' leadership role of women in social change, despite mainstream media's tendencies, illustrates this democratization through the alternative and accessible platforms provided by social media. In the broader context, social media is seen as a powerful force for social change, providing a platform for voices that might otherwise be marginalized or overlooked by traditional media outlets and enabling grassroots mobilization and networking which supports political and social movements.