Ask HN: legally can i build search niche web search engine?
i want to build search engine that searching dally
niche sites , like blogs first page's
then present statistics based on the crawling.
legally can i do this ? There is no legal restriction for crawling any web site. But you should respect robot.txt document for every single web site. Such as: https://www.facebook.com/robots.txt
http://web.archive.org/robots.txt Yes. You can. Google successfully defended it in the past : http://en.wikipedia.org/wiki/Field_v._Google