Be sure to mark where you find it. With older technologies the old rules probably still apply. This can be the name of an article, an author, a slogan, a phrase, keywords, etc.
People are often a very good source for information.
And there are lots of people potentially available on the Internet. Remember that almost everybody is busy. Having said that, you can often track down people's addresses fairly easily. Addresses of academics are among the easiest to find on the web site of their college of university. This will usually go to the person who administers the mail system.