Twitter (TWTR) CEO Jack Dorsey told a Senate panel last week that social media platforms like Twitter and Facebook (FB) “can be addictive,” while bipartisan concerns emerged about potential psychological harm caused by the platforms.

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Sen. Lindsey Graham (R-SC) compared the addictive quality of the sites to tobacco, and Sen. Cory Booker (D-NJ) raised concerns about the toll the platforms take on young users’ “self-esteem and wellbeing.”
In a new interview, movie star Matthew McConaughey expressed similar wariness about the social media sites, warning that users risk placing their “sense of self” on the approval of others and posting messages that they will later regret.
“Especially children and millennials are getting their entire sense of self based on something,” says McConaughey, author of a new memoir called “Greenlights.” “Something that they, ‘poof,’ send out to the world, and they anxiously wait to see what all these strangers