Print Big Tech’s decision to ban the Parler app and block outgoing President Trump is stoking support for alternative social networking sites and apps that bill themselves as promoting free speech and privacy. Facebook Inc. and Twitter Inc. took the strongest action yet to address accusations that their platforms are being used to stoke conspiracy theories, misinformation and incite violence after a mob at a Trump rally broke into the U.S. Capitol last week. Right-wing users have felt maligned and moved to alternative sites such as Parler, backed by Rebekah Mercer, the daughter of hedge fund investor Robert Mercer. A rush to the site late last year made Parler the top downloaded app following President-elect Joe Biden’s victory.