. >> reporter: in san francisco, alyssa gord, nbc bay area news. >> not surprisingly, the attack on paul pelosi is being wildly discussed on social media. today twitter's new owner joined that conversation. >> elon musk tweeted and deleted a response which prompted jackie speier to get involved. here's christie smith. >> reporter: questions still remain following the violent assault on paul pelosi. police haven't determined a motive, and today elon musk, the new owner of twitter, weighed in, tweeting a baseless claim about paul pelosi. >> he is really confirming for all of us folks who are watching what we feared could be the worst outcome of his takeover of twitter. >> reporter: grant is a professor in the department of communication at cal state east bay. >> it's not a surprise. he's quite good, quite a savvy manipulator of social media. if we look into his history, mr. musk has clearly no qualms about messing around and trolling online. so we have a lot to watch for in the next couple of days, but also in the next couple of months. >> reporter: musk's tweet was in response to a tweet