Are there examples of Russian disinformation on social media that tried to influence the last two US presidential elections?

I understand there's some hacks, like leaked emails that revealed private communications, but along with any citations of those few items are often watery assertions that Russian disinformation campaigns included social media activity. I envision a bunch of fake accounts on Twitter and Facebook posting fake stuff. Is that correct? Are there any examples of this? Any evidence of the gravity this activity might have had, on the elections or otherwise?

The following line from an AP article inspired the question:

Russia has tried to influence the last two presidential elections by boosting false stories and using social media to inflame divisions in American society on issues like race and the coronavirus pandemic.