Early this morning, I got my latest invitation to join Linkedin.

I get a lot of these, because I’m not on Linkedin. The very first request came a few years ago, when I was working at a newspaper and an old source sent me monthly requests to join Linkedin. I got one every month for at least a year before either he stopped trying to invite me or I left my job and lost access to that email account. I can’t remember which happened first. Anyhow, since then, I’ve received Linkedin requests from all sorts of people: former co-workers, current co-workers, students, family members, people I’ve met once, people I haven’t seen in years and friends of my family.

It seems like everyone’s on LinkedIn, and since I’m a sucker for groupthink, I’m beginning to wonder: Do I need to be on Linkedin? And if so, why?

I have checked out the site. It looks like a non-scandalous, grown-up version of Facebook, where people use phrases like “communication skills” and “can-do attitude” in lieu of “OMG” or “LOL.”

And although I realize the site is used to network professionals, I can’t figure out if it is useful or not.

It’s not as if I don’t love social media. Those who suffer my Facebook status updates and my Twitter feed can attest to the fact that I love The Network. It’s ridiculous. I’ve been waiting for it all my life:  I write words and people react to (or fail to react to) those words almost instantly. It’s instant gratification. Sometimes it’s instant mortification. And it’s done wonders for my writing — Facebook has honed my comedic skills by teaching me that 80 percent of everything I say is not funny.

Same thing with Twitter, which has allowed me to gradually connect with other writers, and which has also taught me how to craft very, very short sentences while including hashtags and replies.  And these two sites are really just the latest in a series of social media innovations that I’ve loved and abused. Before Facebook, I was on Myspace. Before that, Livejournal. Before that, I was on Friendster. And before that, there were various messaging and file-sharing groups that I can barely remember. ICQ and Hotwire (I think it was called HotWire. It could have been HotLine. Livewire? I don’t know. The software I’m talking about is from 1995. It’s been lost in the mists of time.) Also, AIM and unsupervised chat rooms, and even the old Apple chat software Broadcast.

All of them were useful in their own way, just as Facebook and Twitter are useful to me now, as I build a reader base and follow what’s going on with my friends and in the world. But LinkedIn? How is that useful? Isn’t it just a way to get my resumé online?

And so, because I have no answers of my own, I end this blog with an obnoxious crowd-sourcing series of questions. Are you on Linkedin? Is it useful? How? Have you obtained a job or gained contacts by being on Linkedin? Please, corporate types. Help a sister out.