Most of the tweets say something like "To celebrate the Merge, Ethereum Foundation giving away 50,000 ETH!", and link out to various websites that invite people to send some amount of Ethereum with the promise that they'll receive twice as much in return — a classic double-your-money scam.
At least 36 verified Twitter accounts were compromised and used for the scam, including the 6 million-follower Cityarabia account that normally tweets for Arabic-speaking fans of the Manchester City football club. On the afternoon and evening of September 14 alone, at least 195 ETH (~$314,000) was drawn in by the accounts and scam websites I found.