the social media giant is adopting the do-not-track feature of mozilla's firefox browser. the feature prevents websites from using cookies to track your personal information and online movements. to opt into the service on twitter, you must select the do not track feature within the firefox browser. >>> coming up at 4:00, street magic robbers. where police are looking for a hypnotist, who convinces victims to hand over their cash. >>> a ton of tsunami debris, floating towards u.s. shores. the health worries coming up. >>> and it's friday. what kind of weather can we expect this weekend? don't miss tim's updated first warning forecast. wjz 13 is always on. for the top stories on week.com -- wjz.com, instant updates and first warning weather all the time, click wjz.com. ,,,,,,,,,,, >>> welcome back to wjz eyewitness news. i'm mary bubala, reporting live in thurmont, maryland, frederick county. the site of the g-8 summit in camp david. you know, for any big event you want the weather to cooperate. and boy, did president obama get lucky. we're hearing some helicopters above us