It’s an invasion, that’s what it is.

Adults are leading an online charge into the world of Facebook. For you non-Facebookers not “in the know,” you have the option of allowing others to see your Web site. Some let you in; others do not.

In the eyes of some kids, we’re infidels. Others welcome us as friends.

But we can keep watch once we’re in. In this culture, you need every tool you can get to ensure kids grow up sane.

If little Johnny is plotting to rob a local convenience store, maybe there’ll be a hint on his Web site. Or, if 12-year-old Timmy’s been sneaking out at night and collecting street signs, then here’s your chance, parents, to intervene.

For a while, we adults stayed on the sidelines. We watched our kids participate in this social online network, thinking, I suppose, that it was a “young” thing only.

Now, we have succumbed to the phenomenon. Many of us are downright addicted.

My wife got me started. I love it.

I’ve hooked up with old friends, relatives who live out of town, people I haven’t seen in years. Now I remember birthdays I otherwise would have never remembered. Facebook alerts you when an online friend’s birthday is coming up.

Also, there’s a line atop the Facebook page where you fill in the blank about what’s up with you on a particular day, for example: “Andy is .... a balding, middle-aged white guy who needs regular naps.”

Or today, Andy is “still living the thug life!”

Unfortunately, I also know when “Bobby Joe is … struggling with foot odor.”

LOL, or maybe, TMI.

We adults also, via Facebook, send one another gifts online, including buttons that are sort of online versions of bumper stickers, participate in asinine surveys and voyeuristically watch the social lives of our friends unfold in photo albums.

As parents, a lot of times we see what our kids have been up to by just using parental powers given to us by God. We have that sixth sense that you’ve done something stupid, illegal or otherwise stunning.

In the old days, if a kid got his head stuck in a fence, for example, a neighbor would alert our parents and we’d be “in the know.” At any rate, our parents would act to correct said stupidity because of their network of friends.

Now, in short, Facebook accounts give parents another window into kids’ worlds. I suppose you kids already know that. I also suppose you have some kind of clique-like feeling that we don’t belong. Maybe it creeps you out. I know this because my daughter said: “That creeps me out.”

Maybe you think we’re just voyeurs, snooping around to make sure we’re “in the know” about your lives.

But it’s more than that. Facebook and its counterpart, MySpace, give participants a chance to keep up with friends, families, acquaintances, etc.

Clearly, at first it gave the younger generation a place to socialize minus the watchful eyes of their parents. Now, parental access can put kids in a pickle, of sorts. I invited my daughter to “be my friend” and she accepted. She’s pretty much an open book, though it “creeps her out.” So I can see her site any time.

Other kids I have known for years have declined my invitation. They are entitled to their privacy - once they’re out of the house and earning a salary. But before that monumental time in your life, if you decline our friendship, it will be clear to us that:

1. You think we’re creeps.

2. You’re living a secret life of debauchery, or ...

3. You sense that adults online are just over-the-hill Facebook junkies trying to relive their youth by doing something hip.

But while we’re online in great numbers, it’s not JUST because we want to watch out for our kids; we’re really having a good time, too.

For now, “Andy is ... going home after a long day.”

— Andy Dennis is assistant managing

editor of the Daily News.