I would like your expert advice on how to handle this.

My husband had a full blown affair. He did came back but refuse to end the affair.
They are thousand of miles apart but because of facebook, continues to communicate everyday and have video sex.
They even posted a picture of both of them on the other woman's facebook cover photo.

Since the other woman is posting their affair on facebook, how do I fight back?
I have friends and relatives who wanted to tag and exposed the real truth about the affair and the other woman.
They are amazed on how this other woman has the guts to expose their affair online.

Divorce is not the solution since the other woman wanted to come here in America and have a green card.
I know she is using my husband, but my husband is blind.
She has a history of being a prostitute, my husband will not believe it though.

Are there any in the community who had a similar experience?
How did they handle this?

What do I do?
I do not want to drag my children in this online drama.

Is there any legal remedy?
Can I ask facebook to shut down their account since there's nudity involved?

Can I sue facebook? Because of facebook, a lot of families have been destroyed and having an affair is as easy as calling on your cellphone.

How do I handle this without appearing that I am "chasing" or pursuing my husband?
On the other hand, doing nothing is as if I condone their affair and I am letting this other woman do what she wants online.
The other woman's family and friends were told that the only reason my husband came back is only because of our children. My husband is telling me that he came back not only because of the children but because he still have feelings left for me. He said if it was just for the children, then he can just come and visit the children but not come home and stay with us.


Sincerely,
Legal wife