Keep downvoting, but this won't change the fact that LearnBoost released something that was not ready for prime time. Also learn to read carefully before downvoting as the key word is "unexpected", i.e. I obviously like LearnBoost.
You're getting downvotes because you're complaining about an innovative, cool thing on hacker news that couldn't deal with the traffic. Just try it later.
I am pretty used to many sites not being able to sustain the HN traffic and I never commented on those, but my main point was that I did not expect a service from LearnBoost to be like that as I respect those guys.