I only use whatsapp. It easier and faster as msn or skype. Even with a bad connection I can stay in touch. I never call and people seldom call me (twice a year).
I use my cell phone for me. So if I want rest, go to bed I switch off the internet connection. I answer when it suits me, so do the less people I know. Also whatsapp works way faster and cost nothing if you need to contact a company/customer service. Fb is not my kind of social media.