I think it'll work more like this. There are people who enjoy reasoned debate, even if they don't agree with the counterparty. They won't downvote those tweet

I think it'll work more like this. There are people who enjoy reasoned debate, even if they don't agree with the counterparty. They won't downvote those tweets. Their cluster weight will be gently moving in the direction of others like them, and its weight will let through a wide variety of other gently weighted groups. Others are compelled to screech and foam at the mouth if someone argues for a $WRONGTHINK - even in jest or as a devil's advocate, and will downvote them instantly. Their weightings will be heavy, and will exclude most other groups. They will see only what they want to see, and won't see what they don't want to see -- reasoned debate from groups they disagree with, for example. This is a personal choice, and mirrors physical group dynamics. If someone "in your group" starts talking crazy, they will begin to separate from the group (by mutual down-voting), and migrate to a different group. You (and the rest of your group) won't be affected much.