It feels very "sheep-like" to jump on the "Facebook is nothing but sheep" bandwagon.
There's nothing wrong with it, it's a great technology and it has really changed the way we think about the world. Gahars and I, being recent college students and recent high school graduates, can attest to Facebook's connectivity. I mean I may not want to talk to everyone I met in high school, but I add them on Facebook to keep tabs on them. It's interesting to see people you know from high school grow up, get married, have kids, whatever.
Even for an older man like my dad, he's been able to find friends from his high school (which he graduated from about 30 years ago) and keep in contact or at least keep tabs on them.
There's no "herd" mentality. I didn't join Facebook because it was cool and I'd get spitballs lobbed at me from across the cafeteria if I didn't. I made an account and have used it for several years because I wanted to.
You're an incredibly pompous douchebag if you're going to mark everyone who uses Facebook as part of a "herd mentality" when almost everyone I know who has a Facebook uses it for a reason. Not because it's the "in" thing, but for everything from keeping in contact with friends, using it for easy access to accounts (clicking "Log In with Facebook" is easier than a username and password), organizing discussions for projects, whatever.
EDIT: Also saying that "text messaging" is a substitute is just plainly wrong. First off, how is joining Facebook a "herd mentality" but text messaging isn't? Texting became huge in the past decade or two, and there's a rather large "herd mentality" that goes with it. I use my phone for texting more than actually calling people. I "joined the herd" on this one because it literally became the only way to communicate. Friends of mine (going to throw Gahars under the bus again for this one) can attest to how much of a pain in the ass it was to contact me before I got a phone that could text effectively. I mean they could just call me at my house but people don't do that any more.
Also there's so much that Facebook does that texting cannot. Texting is only equivalent to a crude instant messaging which Facebook has. Sharing images with a large audience, posting status updates (you would never text a friend "Man today was hard" usually but you'll post something like that every day on Facebook), playing games, a lot of things.