Who hijacked my Web page?
Leo A. Martin (Sun, 23 Jun 2013 00:20:25 PDT)

Diana wrote

links are inserted in my blog and web site. e.g. 'shade
cloth' is highlighted and links you to entities selling shade cloth.

This sounds like a "feature" of "free" software used to write Web pages or "free" or
"low-cost" hosting, or perhaps of a "free" browser. I would investigate in this order:
Authoring, hosting, browser. I bet it's your Web hosting.

Leo Martin