

Friends: You used to see certain people only at high school reunions every 10 or 20 years. Now they can 'friend' (used as a verb) you on Facebook, and you can remember why you fell out of touch. The North High School Class of 1936 gathers for their 75th reunion in St. Louis Park, Minn., on Aug. 11. Richard Sennott/Star Tribune/Newscom/File
Relationship Status: Before Facebook, people wore wedding rings to signify that they were married. Any other type of commitment was determined by asking questions, preferably discreetly. On Facebook, if you choose, your life can be an open book. Pictured are attendees of Burning Man 2011 in Nevada, who seem to be declaring their intentions. Jim Urquhart/Reuters/File
News Feed: In the old days, you read a newspaper to find out what was going on, and it was often something relatively important. Now the 'top story' could be what one of your 'friends' is eating for dinner. Mary Altaffer/AP/File
Message: Whether it was sending or receiving, a piece of paper was involved, along with, sometimes, the post office and a now-unacceptable delay. A lot of thought would go into composing a handwritten message. More so, anyway, than the rather painful-sounding Facebook 'poke.' Teacher Jessica Nelson reads a note from a student in Bethesda, Md., in 2000. Andy Nelson/Staff/File
Photos: Photo albums were elaborate, carefully edited, time-consuming endeavors that sat on the coffee table and were exclaimed over by visitors. Here, rebel fighters look through a photo album of Condoleezza Rice found inside Muammar Qaddafi's compound in Tripoli, Libya, Wednesday, on Aug. 24. It couldn't simply be deleted from his Facebook account. Sergey Ponomarev/AP
Chat: This was something commonly done on the phone, to catch up with a friend, or around the water cooler at work. No typing was involved, and you actually had to pay attention. Britain's Prince Harry and Czech model Eva Herzigova speak on telephones on the trading floor of BGC Partners for a charity event in London on Sept. 12. Paul Grover/Reuters/File
Share: Before 'sharing' YouTube videos on Facebook became the preferred communal moving picture viewing experience, people actually sat in movie theaters together and occasionally laughed at the same jokes. Andy Nelson/Staff
Wall: Many community stores had a bulletin board where you could put up notices for services, items wanted, events, and so forth. Facebook's 'wall' also incorporates the idea of wipe-off boards found on college dorm doors, where notes could be left for occupants that everyone who passed by could see (and add to). This is one the most annoying aspects of Facebook for shy or cautious users. Melanie Stetson Freeman/Staff/File