erin moriarty and robert coker, congratulations on the book. e now. you can see erin's full report on "48 hours" tomorrow night at 10:00, 9:00 central right here on cbs. >>> here's a question for you. how do you deal with people who talk about themselves way too much? and is it okay to send a wedding invitation via facebook? "new york times" social columnist philip galanes is in studio 57 with the answer to some of those questions today. it's 8:38. announcer: you're on the right track to save big during sleep train's triple choice sale. for a limited time you can choose to save hundreds on beautyrest and posturepedic mattress sets. or choose $300 in free gifts with sleep train's most popular tempur-pedic mattresses. you can even choose 48 months interest-free financing on the new tempur-choice with head-to-toe customization. the triple choice sale ends soon at sleep train! ♪ sleep train ♪ ♪ your ticket to a better night's sleep ♪ >>> o >>> on average, people spend 50% >>> on average, people spend 60% of a conversation talking about themselves. a

erin moriarty of "48 hours" takes a look. >> reporter: every day riders run through this bay area rapidit or bart station in oakland california. the sign says fruitvale but there's another name that hangs heavy over the platform: oscar graham iii. >> that's my favorite picture of my baby boy. >> reporter: wanda johnson is oscar graham's mother. what do you love about that picture? why is it your favorite picture? >> because his mouth speaks to everybody. his mouth speaks to me. >> reporter: bart police were waiting on the platform when a train rolled in about 2:15 this morning. >> reporter: in the early morning hours of new year's day 2009, 22-year-old graham and some friends were on the bart train returning from celebrating in san francisco. there was a report of a fight. when the train pulled into the fruitvale station, bart police started pulling oscar and his friends off the train. other passengers pulled out their cell phones and recorded video of what happened next. describe that video. what did you see? >> in the video i see that there's an officer out with a taster walking back