Earlier quoted context omitted.
I have on my phone: Standard text messaging ConnectBot (to an irssi session for IRC) The answer is just to say no when people ask you install $appoftheday to contact them. No hangouts, no skype, no whatsapp, no facebook polluting my phone with their intrusiveness and always-on-in-background tendencies. One person occasionally asks me to install Whatsapp, but each time I say no. Hangouts is a pain to remove if it came…
I'm curious how many people in the real world actually use IRC. Find 10 people on the streets of New York and statistically zero use IRC and maybe, maybe 1 has even heard of it. Ask those same 10 people if they've heard of WhatsApp and likely 3 or 4 would have heard of it and probably 2 would have it on their device. If they're from outside the US, that number would go up to likely 7 would have it installed. Ask thos…
As for IRC, it isn't how many people use it, but who uses it; namely a huge proportion of technical communities and people I want to communicate with.
As for Hangouts, it's in the default OEM ROMs, obviously, but also in the gapps packaged for CyanogenMod unless you remove it before flashing (as I did).