Facebook, Twitter, LinkedIn — Which Is the Biggest Social Network In the Land?

If you put up a post and nobody sees it -- you didn't do it on Facebook.

The Menlo Park powerhouse is still America's most-popular social network, with 71 percent of adults over the age of 18 clicking like on Facebook, according to the Silicon Valley Business Journal.

According to poll results from the Pew Research Center, Facebook is by a large margin the most-used social network for adults, with the No. 2 spot LinkedIn, at 22 percent saturation among adults.

Next is Pinterest at 21 percent -- and then it's Twitter, at 18 percent.

Retweet all you want -- 82 percent of the country will miss it.