It helps to have a friend when you read tough books. Shared highlights and notes help keep you engaged to push through the tough sections.
Share your margins. Have conversations about the book inside the passage you are reading.
Whether you want to join a group or read by yourself, Piraeus supports both.
The best book clubs we have been in have been the ones where members have a little skin in the game. Everyone tends to participate more when they buy the book. Piraeus is $5.