there is poll on matousec.com with very comprehensive AntiVirus list …
will be nice if all Avast! forum visitors take part and vote not just for Avast!
but all others AVs You use and like as multiple entries per vote are accepted …
The only way they could remove duplicates would be if the stored the IP address. Without the cookie they would have to store it with the vote. So if you have a dynamic IP address the next time you log on it is likely to be different.
However, it is technically possible to have many people assigned the same IP over time so different people could vote but if the remove duplicates based on IP address only (unlikely though), that too would make the voting inaccurate.
The poll is at a very early stage so not many votes have been cast, so any vote will have a large effect on the percentages. I think when I voted it was on about 33% and my vote took it up to 37% so big swings in early voting.