You're not completely in the clear if you still use the same username throughout the web or as the start of your email address. If your account gets compromised

You're not completely in the clear if you still use the same username throughout the web or as the start of your email address. If your account gets compromised on a site that allows users to make public posts (comments, articles, whatever) your online identity is now linked to whatever crap the compromiser posts under your username.