the FB report doesn't actually present or claim to have any substantiation that the accounts which paid for advertising were associated with one another, that they were Russian, that they were political in nature, or that they were related to the USA election:
.
"Our analysis suggests these accounts and Pages were affiliated"
"likely operated out of Russia"
"The vast majority of ads run by these accounts didn’t specifically reference the US presidential election, voting or a particular candidate."
"potentially politically related ad spending"
"even those with very weak signals of a connection and not associated with any known organized effort"
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Just weasel words and suggestivity. Also, $100K of advertising is 0.00147% of the total $6.8 billion spent on political advertising for the 2016 US federal election campaign. Doubt anybody was swaying an election with $100K of non-political ads.