Levels of Distractibility: Who cares? = *. Some people will be distracted from your meaning: = **. Many people will be distracted from your meaning: = ***.
Question: Is there a difference between "everyone" (one word) and "every one" (two words)?
Answer: Yes. "Everyone," (one word) means "all." "Everyone is coming to the party."
"Every one" (two words) means each person in a group: "Every one of us will have to vote for our candidate."
Both "Everyone" and "Every one" take a singular verb.
Rating of Distractibility: **. Not many people know the distinction between the two, so not many people will notice if you use one or the other.