Originally Posted by Thrombin:
“All of them have worked as top 4 this series. Previous series' vote to save was top 3.
It's true they've also all worked as everyone with 2+ but I've never heard it stated that that was the method. Seems a bit harsh! It hadn't even occurred to me.”
Traditionally, it was the 2 or more with the most nominations, and this was stated in the rules on the C4 site. For example, this is from the bb11 rules: "The two or more housemates who receive the most nominations will face the public eviction vote that week."
As recently as bb13 (which was vote to save), that still seemed to be the rule, though I'm not sure it was ever explicitly said. It certainly wasn't 'top 4' then; and I think the most likely explanation for what they've done in bb14 and in this CBB is that it's everyone with at least 2 nominations.