SPAM is getting something you didn't ask for, abusing your time and money.

Simple:  GOOGLE is the Biggest SPAMMER on the net.

The fix  ☞

You CAN intelligently filter Google.
You can use them for your search engine, but you will not be bombarded by their ads or stripped of your online privacy by the
Storm Troopers of Mountain View.

CUSTOMIZEGOOGLE - just do it!

ANOTHER PROBLEM:

There are thousands of web sites that exist only to decrease your privacy through surreptitious collection of where you browse or what you browse for.  Worse, some of this web-page trickery is strikingly akin to phishing - they KNOW you would not like to give them the information they are collection - SO THEY TRY TO TRICK YOU.

There are further thousands that fill your screen with undesired ads, popups, or other dribble.
Bad folks, these ethically damaged SPAMMERS.
And, yes, Google is a Spammer.

They deliver links to sites you did not ask to see.  You can just delete them from your life and immediately enjoy more time and more privacy.

You can use the Adblock extension (highly recommended)
in Firefox to individually filter them

And, (more easily, but less customized for you), you can take down hundreds at once (and speed your browsing experience in the process) by supplying incorrect address for these parasitic sites

Turnabout is more than just fair play:
It is obligatory for anyone not wanting to be a web-dupe.
 

ANOTHER SOLUTION:

You can protect your system (for all users at once) super easily by replacing a single file - called the hosts file.It is plain text and I encourage you to read it to understand what it does.
Then you can improve it for your own use as you see fit.

Here is a clean and safe hosts file.
It replaces all the useless 'doubleclick', 'google-analytics', sites with a link to yourself.  What goes nowhere, stays nowhere.

Read and compare your HOSTS file with mine (or others) and be astounded!

If you replace your own hosts file (found at C:/Windows/System32/Drivers/Etc/hosts)
with this one you'll instantly enjoy more privacy and a faster browsing experience!

There are others on the web, if you don't like mine, just search.