The tendency to connect with similar or like-minded individuals online as offline, what Thelwall (2009) calls homophily, means that social media may not foster diverse spaces for knowledge exchange and negotiation, leading instead to “echo chambers,” a situation in which we share knowledge and perspectives with individuals who already share the same views as ourselves.
This is becoming especially more common with "search" tools on social media that have specific algorithms that show us exactly what we want to see