Blog > ublic Knowledge Responds to MPA Chairman and CEO Charles Rivkin on Site-blockingPublic Knowledge Responds to MPA Chairman and CEO Charles Rivkin on Site-blocking Apr 9, 2024 · by Shiva Stella ublic Knowledge Responds to MPA Chairman and CEO Charles Rivkin on Site-blockingPublic Knowledge Responds to MPA Chairman and CEO Charles Rivkin on Site-blocking Originally Posted On: Public Knowledge