Types Of Secrets And Their Ranking

S1 secret: you keep to yourself and die with it.
S2 secret: you share with your partner or close friends.
S3 secret: you share with your family
S4 secret: you share it with everyone.
We can put them in order as follows:
S1 < S2 < S3 < S4.

However, secrets may leak from one space to another. One may expect that
S1 goes into S2 goes into S3 goes into S4.
A reverse is also possible
S3 goes into S2 goes into S1,
this happens when a criminal eliminates the evidence.
Note that S4 is public domain.