Ebay has just announced that it was hacked and some accounts may have been compromised. To be on the safe side, Ebay is asking users to change their passwords.
http://www.washingtonpost.com/blogs/the-switch/wp/2014/05/21/ebay-asks-145-million-users-to-change-passwords-after-data-breach/
http://announcements.ebay.com/2014/05/ebay-inc-to-ask-ebay-users-to-change-passwords/?_trksid=p3984.m2301.l3955