New York's definition is one of the most detailed. The Australian definition on the other hand probably includes Hacker News because it includes both "a logged-in feature" and "endless feed" and the fact that posts move off the home page probably falls under "time-limited features". Perhaps some legal interpretation will find that paging is not legally "endless feed", but I could see it going either way. The definition basically is written so that blogs with comment sections aren't included, but with quite an expansive scope otherwise.