I would have to say "SoundHound" because i can never remember the names of songs anymore like i did when i was a teenager so i just click it open let it listen and in a few seconds it tells me the name and singer. I love it..
Yeah, it's hard to be active on it, all the time. It takes a few weeks to get used to logging in. Now, I run to it every time I pop something in my mouth. It makes me accountable, and at times, it makes me think, "wait a minute! This will put me over my calorie limit!" And I end up eating something else, or just drinking water.
I love love love carrots! They make me feel full and the whole small bag is 175 calories! LOL
I have the myfitnesspal but forget to use it lol
Google maps, meetup app, and kindle. I use those the most. The most useful is myfitnesspal one. It helps me with my calories.