EchoShield: Understanding Structural Hole Spanners to Mitigate Echo Chambers. - Maloth Rajashekar; Posimshetty Chaitanya Shesha Govind; Sudheshna Reddy Thirumalareddy; Nakka Sai Sankar; Roshni Chakraborty; Flavio Bertini 001; Mahua Bhattacharya (WebSci (Companion), 2026)