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

"Iä" is a word used to address eldritch Lovecraftian gods of supreme cosmic evil. Probably the (currently) most common use of this greeting is "Iä! Iä! Cthulhu fhtagn!" Which basically translates to "Hail! Hail! Cthulhu sleeps!" "Iä!" is pronounced thusly: ee-AY! (same phoenetic vowel combination as "eat cake.") This word can also be used to describe something suitably badass, or perhaps evil in a hokey sort of way. It's quite versatile.

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.

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

insha'Allah, the Arabic language expression meaning "God willing," is used as a qualifier for all planned future actions to remind the speaker and listener that nobody can positively know what the future will bring, but rather, all depends on the will of God.

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)