Spam Posts

What is the deal lately with Spam Posts? For the second time in a week, I've had an anonymous comment with this bizarre statement. It looks like spam because it makes absolutely no sense. I may have to change my comment settings. Its getting annoying. Does anyone else have this problem?

I need suggestions! I am doing an internet searching class at my library at the end of June demonstrating how to tweak search engines to find what you want. Like using the advanced search options, limiting to a domain, choosing key words, etc. Here is my problem: I need good examples! I'm having trouble thinking of a good search topic or topics. Something beyond just a simple subject search. I had thought of doing a search for the history of one of the national parks and the people who were displaced, but that is MY interest. Someone else may not be as interested. Any ideas?