Look for the author's name near the top or the bottom of the page. Anyone who has visited a chat room knows that people don't always identify themselves accurately. Look for an email link, address, or phone number for the author. Be careful of web pages from those sites, too. The purpose could be advertising, advocacy, news, entertainment, opinion, fandom, scholarship, satire, etc.
Some pages have more than one purpose.
The Phantom Menace. The content might be years out of date even if the given date is recent. This takes a little more time to determine. Compare the information on the web page to information available through other sources. In general, information for science, technology, and business ages quickly.