tyler watkins was named in the chat logs. >> smith: zetter called watkins. he told her about a conversation he'd had with manning during manning's january visit to boston. >> brad had told him that he uncovered information that was concerned him and he was considering leaking it. and so, he was weighing that-- whether or not the good that he felt he would be doing in leaking the information outweighed any kind of, you know, personal suffering that he might undergo for leaking it. >> smith: on may 26, 2010, bradley manning was arrested. it was posted on facebook. >> we got confirmation that manning had been arrested when manning called his aunt from jail. >> and asked her to update his facebook page with a message. >> smith: it would be his final facebook entry. >> i just couldn't... i couldn't believe it. didn't seem true. i guess part of me probably believed that this would... that this would turn out to not, you know, be anything. and, well, i guess i was wrong. so... >> please welcome julian assange. ( applause ) >> smith: in the weeks before manning was

tyler watkins was named in the chat logs. >> reporter: zetter called watkins. about a conversation he'd had with manning during manning's january visit to boston. >> brad had told him that he uncovered information that was concerned him and he was considering leaking it. and so, he was weighing that-- whether or not the good that he felt he would be doing in leaking the information outweighed any kind of, you know, personal suffering that he might undergo for leaking it. >> reporter: on may 26, 2010, bradley manning was arrested. it was posted on facebook. >> we got confirmation that manning had been arrested when manning called his aunt from jail. >> and asked her to update his facebook page with a message. >> it would be his final facebook entry. >> brown: "frontline" airs on most pbs stations tonight. and you can find a conversation with martin smith on the "rundown blog" on our web site. >> ifill: again, the major developments of the day: the death toll from sunday's tornado has risen to 122 with more than 750 injured. and new tornadoes struck in oklahoma t