Hacking WordPress.com?

This is my post after long time ago I could not enter to this blog. Username and password wrong of combination. WP-login, prohibited to enter. My email has been changed and username also. Guess what, if he/she can enter this blog  with my email, or username?  I think the good answer is, he/she known my easy password. 🙂 so,  change your passoword with very difficulity guess.  hacking wordpress.com, is it possible?