I'd recommend this as well. When I did my big migration to LastPass about a year ago (i.e. logged in to every site I ever remember having used and changing the password to a randomly generated one), I thought I was all set. But the site has reminded me at least three times that I registered to alot of BBS-style message boards and maybe only made one or two posts before abandoning them forever and forgetting I ever registered.

Those are concerning, because I'm positive that something I registered for in 2006 and never used again probably used a weak, re-used password.

Why has this been downvoted? Is it because of a known issue with the mentioned site?

It was interesting when I found my name there the first time on service I did not even remember using. But I did and I just forgot about it. Luckily at time when I was already using different passwords everywhere.