Some days in product management feel like Sisyphus, all alone, pushing a boulder up a hill, only to watch it roll back down. The truth is that there are many facing similar challenges, most with advice to share. Many of themĀ are quite vocal on Twitter. Below are a few high-signal Twitter users that post on product management topics. Cindy Alvarez (@cindyalvarez) Geoffrey Anderson (@gander2112) Steve Johnson (@sjohnson717) Jeff Lash (@jefflash) Rich Mironov (@richmironov) John Peltier …