Writers are told we need to “build platform”–have websites, grow our email lists, and build community on social media. Many of us have invested many hours over several years to grow a following on the Site Formerly Known as Twitter, only to watch one egomaniacal billionaire destroy that site piece by poorly-redesigned piece. I’m still on there (for now; follow me @ja_alcorn), but I’m engaging less and less as the most interesting people leave the platform and the bigots and haters take over. Instead, I’m trying out Threads and BlueSky, two new social media options for writers. I’ll share my experiences with both platforms in a minute, but first: The…