Various sources report that Linked-In passwords were compromised by a security breach in 2012 which has affected many more users than first reported. CNET has a detailed story from May 26 here. All passwords that have not been reset recently should be changed, and CNET recommends 2-step verification.
Furthermore, users should be concerned if they used this password on other sites, and consider changing them on those sites, too.
There is a telephone and phishing scam where the caller claims that your Microsoft account is disabled (it's not) and unbelievably leaves an 800 call back number. These programmers in Russia are pretty desperate for $$ because of Putin's pro-natalist economy.