The WaPo tells us the Russians were buying all sort of Facebook ads just to stir the pot:
Russian operatives used Facebook ads to exploit divisions over Black Lives Matter and Muslims
The batch of more than 3,000 Russian-bought ads that Facebook is preparing to turn over to Congress shows a deep understanding of social divides in American society, with some ads promoting African American rights groups including Black Lives Matter and others suggesting that these same groups pose a rising political threat, say people familiar with the covert influence campaign.
The Russian campaign — taking advantage of Facebook’s ability to send contrary messages to different groups of users based on their political and demographic characteristics — also sought to sow discord among religious groups. Other ads highlighted support for Democrat Hillary Clinton among Muslim women.
Writing at The Atlantic, Alexis Madrigal has interesting speculation as to Russian motives. After all, $100,000 in ads doesn't sound like much.