Joseph Gordon-Levitt thinks social media targets “primal emotions”. The 41-year-old actor has hit out at the ever-increasing influence of social media, and warned that the big tech companies are purely focused on profit. The Hollywood star – who shot to fame as a child – told The Independent: “I mean the system of how social media works, these machine-learning algorithms that lead to sensationalism, reductionism, tribalism, extremism, authoritarianism. All those things, what they have in common with pornography is that they stiumlate the limbic system. They hit here [thumps his chest]. “They’r…