Rid yourself of long email threads with micromobs
mashable.com
mashable.com
Interesting.
Edit: I suppose the occam's razor explanation is that someone emailed (or twitted) the link around asking for people to show them some support in here, instead of an intricate botting conspiracy.
It's distasteful.
I'm sure that a lot of the folks on HN are here because someone in a startup emailed the other folks they know in startups and said "check out my thread on HN and give me a vote". That's how I first found out about it and YC.
Spam might be distasteful, but I don't think there is anything distasteful about someone from a startup introducing other startup founders to the site and asking them to get involved. It might take new members of the community a while to learn the rules, but there is no innate correlation between being new and being a spammer. And HN isn't normally an elitist place where length of tenure implies respectability. I don't think anyone wants to see it turn into the tech community equivalent of a country club.
The other startups in Founder Institute try to support each other wherever possible (as do YCers obviously), but I think there are a few folks less familiar with the "substantive comments only" mantra on HN. But they're not bots.