means InActive as in, will not be active on twitter for the time being

"Insha Allah" which means "If God Wills it or God Willing" in Arabic

I agree, often used amongst bloggers.
Short for iawtc or iawtp.

A vocaloid who is in her teens her voice source is Lia(Japanese singer) .
She sings most of the Kagerou Project by Jin(Shizen No Teki-P)

Ias value education, friendship and acceptance above all else. They put maximal effort into everything they do, and are clever and intuitive. However, Ias are all typically potential psycopaths who have a hard time talking about their feelings. They are one of the most loyal friends you will ever have- you will have a very hard time getting rid of them, since they are also somewhat clingy. But be glad if you ever meet someone named Ia- although they have too many negative qualities to count, they are also loyal, kind, have good memories, and will stick with you to the end of the line.

In A Second.
When you are busy doing something and someone asks you to do something and you know you aer never going to do it use this term and hope they forget about it.

Itchy Ass Syndrome;

Chronic itchiness of the buttocks/rectum area. Does not include lower back. Usually only lasts for one day, but can persist for longer. If symptoms last for more than a week, consult a doctor.