Select the most appropriate option to fill in the blank.

Several pictures and videos have been circulating ______ social media featuring her.

on

The most appropriate option to fill in the blank is on.

The word on means in or to a particular place or position. In this case, the sentence is saying that several pictures and videos have been circulating on social media featuring her. This means that the pictures and videos are being shared on social media.

The other options are not correct.

• By means done by or produced by someone or something. It does not make sense in this context because the pictures and videos are not being done by social media.
• Of means relating to or belonging to someone or something. It does not make sense in this context because the pictures and videos are not relating to or belonging to social media.
• To means in the direction of or in order to reach. It does not make sense in this context because the pictures and videos are not going to social media.