Can we have an option to mail a message to all team members at once?

Yep, go to the drop down menu 'Team' on the top of page.. Then select the bottom most option... "configure / join a team.... " , It will open team details for you and there you can find the option "send team mail". If you send a mail through that option it is delivered to each and every active member of the team. But remember only team leaders cand send a Team mail.

I hope if it helps!

Yes, team leaders get one message a month to all team members you can find it here.

http://www.funtrivia.com/friends.cfm

Holy crap. That's wonderful.