frances kuo, nbc news. >>> first look at all wall street will tick off the day. opens at 12,369, the s&p dropped 1295 and the nasdaq dropped 34. taking a look at overseas trading this morning, in tokyo the nikkei added 22 but in hong kong the hang seng was down 29. >>> well, severs start the week with concerns about the new facebook stock and the continuing debt crisis in greece. the leaders at the g-8 summit meeting at camp david in maryland strongly urged greece to stay in the eurozone and promised to do whatever is needed to solve the debt crisis. >>> well, this could be a crucial week for facebook after friday's ipo, which went as high as $45 but quickly faded to close only 23 cents above the $38 opening price. the nasdaq market had troubles and problem s wis with facebook trades and is now promising to revamp its technology systems for handling stock offerings. >>> and facebook founder mark zuckerberg changed his status to married. after a surprise wedding saturday to his longtime girlfriend, dr. priscilla chan, who just graduated from medical school. >>> ya