Metamask is a crypto wallet manager, and often people mention it in Tweets because they're having some kind of problem using it, so spambots reply with links to

Metamask is a crypto wallet manager, and often people mention it in Tweets because they're having some kind of problem using it, so spambots reply with links to fake "Metamask support" pages that helpfully guide you through the process of handing your private keys over to someone who will immediately steal all your bitcoins and monkey JPEGs. That particular type of spam has been around for a while now so people must still be falling for it.