> So I add him.

There's your problem. Why on Earth are you adding people that you don't know at all? I'd like to see you back up your "So most people just add them" statement with hard evidence. I for one, do not "just add" people just because they circled me. I first check to see if they are someone I care about at all.

This isn't quite "hard evidence", but as an...experiment...a few weeks ago, I added every single person Google recommended, a total of 1118. Of those, 65 complete strangers have added me back, which is 5.8%. This percentage is not "most", "many", or even "some". It is irksome to see the red notification for no good reason, but I do not think people really feel compelled to add random people to their circles.

Hah! That's awesome that you did that experiment. Very interesting.

Out of curiosity, how long did it take to add 1118 people by hand?

Not long at all, actually. The first time I added people, Google was recommending around 600 users. So I just selected all, the dropped them into a new circle. Same process to get the rest of the remainders over the next few days.

Now, Google shows maybe 100 or so recommended users, which is below my threshold of "fun number of people to add at one time". I say "maybe 100" because, interestingly, Google+ no longer shows the number of recommended users. I wonder if they removed this feature because of visual clutter, or were finding a lot of people abusing the feature like I did.

Then you must be friends with "online media sociopaths". The solution is simple, don't add people you don't want to be updated about.

Do your due diligence.

Don't add anyone you don't know. Or, if they 'seem' interesting, banish them to a dark circle that you visit perhaps once in a few weeks.

It was an example. I do not add them anymore. But I get constant notices of random spammers adding me. And these notices show up on every Google page, including normal searches. There is no way Google can tell Mr. X is a friend of a friend or a random social spammer.

Even if you do the right thing, you get those notices. And even if only some of your friends fall for it, it spreads. And I don't blame them, it's a hassle to check.

Edit: and of course, I am not publicly listed! But they can bypass that by adding friends who have their list of contacts public (a default!)

How is it anybody else's fault if you're the one that adds spammy strangers without checking their profile, and then you're not bothered to remove them?

...your problem is that spammy people aren't spammy enough to get removed from your circle for being spammy?

Do you auto follow every spambot that follows you on twitter?

How is this different from Facebook? I get a friend request from Mr. X. He looks like a normal guy, so I accept. Then I get his spammy stream.

When someone you don't know adds you to one of their circles, that just means they found your public posts interesting. It doesn't mean they want to be your friend. They're just following you, like on Twitter.

Downvotes, you say? Well, if you took a minute to learn how G+ works and how easy it is to avoid annoyances, then you wouldn't be posting hypothetical and very misguided complaints about your "friends'" accounts in regards to interaction on G+.