Mr. Uchiyama, the president of Hottolink Inc, said all 2ch postings were sent to
their servers every 5 minutes and they had privileges to use these data.
2ch UNEI has said nothing about this until now, so we don't know wheter or not it is true.
Source (sorry it is affiliate Japanese blog):
株式会社ホットリンク「2ちゃんねるの全書き込みを5分ごとにサーバーに送っている!これの独占的な利用権を持っている」:ハムスター速報
http://hamusoku.com/archives/7800136.html