Exactly, I don't like it when people send the same questions over and over again... I'd like to see some originality :)
And I do answer people who just say hi, or how are you, until I get bored with it. If I have lots of people messages me, I ignore the boring messages xD
How are you doing... it's like asking "how are you?". Basically someone's just asking you if you're feeling okay or not :)
What's up... it means "what are you doing" but in a more informal way. :)
Haaa I've made snowmen when I was a kid xd