For me, it's the idea that you need to be on every single social platform at once. Sounds great in theory - more reach equals more growth, right? But in practice, most brands end up spreading themselves so thin that everything becomes mediocre. You're not building presence, you're just generating noise.
A colleague once pointed out that each network serves a different purpose for its users. People come to LinkedIn for professional insight, Instagram for visual inspiration, Twitter for hot takes. If you dump the same commercial message everywhere, you're not respecting the context. The trick is to match the message to the platform - and that requires real focus.
For a startup or a small team, trying to own five channels simultaneously is a recipe for burnout. You're better off owning one or two deeply than being average across ten. Think of it like investing: diversified for safety, concentrated for growth.