Twitter has major security problems that pose a threat to its own users' personal information, to company shareholders, to national security, and to democracy, according to an explosive whistleblower disclosure obtained exclusively by CNN and The Washington Post.
Password reuse means a twitter compromise would lead to accounts being stolen all over the Web. Hijacked Twitter accounts could be used directly for all manner of impersonation scams and spamming. Security matters on every site because every site has some potential to leverage attacks on others.
I didn’t think about this, so you made an excellent point. I haven’t reused a password in years now, so I forgot that’s a thing.