When big name hedge-fund managers like Cliff Asness feud with the Twitter masses, major investors notice. Here are the behaviors that could cost them billions.

· Hedge-fund investors have added the social media accounts and online activity of hedge-fund managers to their due diligence checklist in recent years.
· Managers like AQR's Cliff Asness and Eminence Capital's Ricky Sandler have been very public about their thoughts on politics and the pandemic, respectively. 
· One...