Social media companies came under fire again last week after another mass shooting was linked to a hate-filled manifesto posted online. For years, Twitter Inc. and Facebook Inc. largely reacted to horrific events after the fact. Now they’re now being asked by politicians to take a more proactive approach to prevent domestic terrorism. But while the companies certainly want to make their platforms safe and not be seen as nests for violence or hatred, the proposals from politicians wouldn’t be easy to achieve and could even backfire on some of the proponents. The attacker in El Paso, Texas, who killed 22 in a rampage at a Walmart Inc. store last Saturday, posted a racist screed on message site 8chan minutes before the attack began, laced with words and phrases President Donald Trump has used in reference to immigrants and the media. On Monday, the president ordered federal officials to work with social media companies to identify people who may perpetrate … [Read more...] about Facebook, Twitter pressed to help prevent domestic terrorism