Whatsapp is not so useful unless you have internet access, correct? I purposely avoid a data plan on my phone, so I haven't downloaded it. But I've noticed more people asking me to use it to communicate with them.

I've been saying goodbye to Facebook too. Not because I've got a preferred alternative, but because it's deliberately engineered to suck you into it. In the short term, you spend more time on it. In the long term, you set up systems to avoid visiting such a time sink. I never feel good after spending time browsing Facebook.