Is Material Found on the Internet Considered Public Domain?

“I am a writer and occasionally would like to use illustrations on my blog site. If I find a picture, illustration, graphic, etc., on the Internet may I copy, paste, re-size it to include it in a blog posting without getting prior approval unless specifically required? If the material is “out there” on the Internet is it considered in the public domain and available for public use?”

No, material on the Internet is subject to copyright just as if it were in a book or magazine.