I think if you use it for the right reason it can be alright.

Like you, my W used fb all of the time, and I felt that it created more of a problem for us. Instead of talking to me about her day or getting excited to see me, she spent A LOT of time on fb doing those things with her "friends". My W did not meet OM on there, but I believe she exchanged plenty of messages with him and deleted them immediately.

In case you couldn't tell, I am not a fan of fb

BITS

M:34 W:28
SD:9
D:6 (pr)
M:3 T:6
Separated 1/16/11
ILYBNILWY 10/25/10
PA discovered 11/12/10, began about 10/1/10

I am not who I was, I am being remade, I am new...