as you know, in this world of digital media, everyone can live a multi-layered life. And the tsarnaev brothers were no different. Today, abc's alex perez tracked what may have been any hidden part of... See More
as you know, in this world of digital media, everyone can live a multi-layered life. And the tsarnaev brothers were no different. Today, abc's alex perez tracked what may have been any hidden part of their lives. Reporter: Friends and classmates describe dzhokhar tsarnaev has an average 19-year-old who didn't talk much when it came to controversial topics. He didn't seem like a bad guy. Reporter: Authoties are zeroing in on every detailf this tsarnaev brothers lives, including social media. Any possible trail of evidence that may lead to answers, like his russian facebook-like page. Abc news brought in a russian translator to pour over the profile. It has several links to islamic websites and pro-chechen websites. And this tweet from last year. A decade in america, already, i want out. Dzhokhar tweeted frequently, including five tweets the day of the bombings. He responded to a friend's tweet, saying, in part, god hates dead people? Or victims of tragedies? Lol. Those people are cooked a year ago, he mentioned the marathon. Boston marathon isn't a good place to smoke. His older brother tamerlan also left behind a social media footprint on youtube, where he created a play list called terrori terrorists. The tsarnaev's aunt who lives in canada. For me to believe that they exited these kinds of atrocities cannot be taken lightly. Convince me. Reporter: She argues their social media lives only show the brothers were curious. Why wouldn't just, you know, just, out of curiosity, tamerlan wouldn't go in there also. Reporter: One of many questions authorities will sift through in the weeks to come. Alex perez, abc news, chicago.
This transcript has been automatically generated and may not be 100% accurate.