Facebook and Twitter, the two largest social media platforms to permanently ban President Donald Trump for his role in last week's Capitol riots, saw $51.2 billion in combined market value erased over the last two trading sessions. Companies across sectors have responded to the president's rhetoric in recent days by pausing political donations, making statements decrying his inflammatory remarks, and pulling products with links to right-wing movements. Facebook and Twitter possibly took the biggest retaliatory steps when they indefinitely banned Trump from their platforms on Thursday and Friday, respectively. Both companies cited the risk of additional violence for their bans,...