It's very bizarre. Many people feel compelled to blurb out to the whole world for all eternity stuff that they wouldn't say to anyone in person. If they commit a crime, then they post incriminating evidence online, cuz "pic or it didn't happen," amirite?
You can use social media wisely. I've seen small-scale businesses use social media for business and for business only. No talk except business talk. Other people use social media to share baby pictures with actual real life friends and family and not with the rest of the world.