Skype, Discord, YouTube, Miitomo and Chrome are the primary ones I use, though I have been dabbling in a bit of Zenonia 3 lately.

I have Moto G 3rd Gen
Mostly used for Twitter, Chrome, YT, Inbox and Play Music.
As for gaming I dont exactly play much anymore. In the past Ive played countless endless runners, Hitman Go, Pokemon Yellow and other random emulated games (none come close to the hours spent in Pokemon though),

Simpsons: Tapped Out, Miitomo, Tiny Tower Vegas, Virtual Beggar, Facebook and FML are the apps I use every day, as well as Safari and email.

Youtube most of the time, still waiting for miitomo.

I've got a Samsung Galaxy S3 and I mainly use these apps:
Marvel Puzzle Quest - Way too much but it's so addicting!
Facebook
7 Little Words
Weather Network - To see when this f-ing winter is going to end already.

LG Optimus L9 II

Miitomo, Whatsapp, One Piece Treasure Cruise, Google Chrome, YouTube, Google Maps and a couple others...

Xperia z3, I use Facebook, whatsapp, chrome, youtube and now I'm playing a free Final Fantasy game square has online

No wonder Miitomo is popping up here after its release, let's wait and see how many remain after a few months

Before I mentioned apps I've been using more frequently this past month, but I also use: Chronus, Chrome, Gmail, Google Now/Keep/Hangouts/Fotos/+, Podcast Addict, WhatsApp, Facebook, Mi Fit, Unified Remote, Navigon, MobileVOIP.

S4 mini looking for an upgrade but still in doubt of the z3 compact due to obvious reasons.

Wechat, Fb, Whatsapp

Youtube, Twitch, Facebook, Gmail, Google, Whats app, Spotify, Instagram, Twitter.