Andriy Moraru brings a very nice review of the existing forex social networks, including a measure of the activity on these forex social networks and their value to traders.
The 7 social networks that Moraru reviews are Currensee, MyFXBook, FXStat, Forex Factory, MeetPips, FXBees and MeetFX.
I recommend reading his great overview and voting on his poll. Do you use forex social networks?