The oldest comments are all at the bottom and are short, trivial and grayed out comments. One of those comments appears to be legit and another appears to be from a fellow Brazilian entrepreneur. However the rest are suspect.
The submitter/author of the post created his account 23 days ago.
The following accounts were all created 22 and 23 days ago and have only commented on everwrite related posts.
http://news.ycombinator.com/user?id=mateusbicalho http://news.ycombinator.com/user?id=bgrossi http://news.ycombinator.com/user?id=lucasarruda
These accounts were created shortly after this was submitted and have only posted on this submission with the same short, positive comments.
http://news.ycombinator.com/user?id=jpresende http://news.ycombinator.com/user?id=eusouomatt
These all do have real name formats, so perhaps these are all employees of everwrite and were asked to come vote this up? I'm not sure what the official rules are here, but it certainly leaves a bad taste in the mouth to send five associates here to vote this up and comment on the article in the early stages of the post, where five upvotes likely makes a large difference. And if it's straight up sock puppeting, it's simply unacceptable.
EDIT: I take back that one of the early comments seems legit, this account http://news.ycombinator.com/user?id=lucianot is also associated with everwrite in some way. http://twitter.com/#!/lucianot/status/114152173767639042
I hate to be the one who makes the drama, but the whole thing seems disingenuous to make all these fluff comments without disclosure and is not beneficial for the community. Imagine if a company with 2000 employees sent an army this way!