Using Facebook is actually a good way to stay in contact with your family back home too... Not so great for emergencies though... There's free wifi in the lobby if you bring a laptop or I think they have computers there too... Just make sure you only check it a couple of times... You're there to have fun in the sun with a bunch of great people, not checking these addictive forums and facebooking.
Oh no, don't want to check facebook or anything like that. My kids are 22 mo., 10 and 11. Over protective mommy thing. Will get over it, tho. All the pics of people on the Boobs Cruise are getting me to count down the days!
We have US Cellular and setup that our phones can call Mexico if necessary. Otherwise, we call back home a few times using a calling card at the convience store next door to call home. If there were an emergency we give the number to the resort. After our 5 trips I'm sure family has figured out where we go.
I used Facebook to stay in touch with my kids last Oct. I think if you give the hotel phone number to a babysitter with your room number, and keep in touch via FB that it is all good. You can't guarantee internet access, but in an emergency they can at least leave a message and you can call back at $1 per minute. With FB you can stay in touch with non-emergency type communication. It is probably a blessing and curse that my kids are high school age, except for the fact that our neighbors will message us with shenanigans at our house - lol - kids, don't even try it!!!