Idiomatically, "though" is used whenever the speaker has a "second thought" (remembers or suddenly realizes a reason or evidence to support the opposing position). It's also a short version of -- and less formal than -- "although." You seem to be using it as one would say "even though" in this context:
"If you were wondering why i have two accounts it is because the other
one is too public, even though I'm still using it, but I'm no
longer posting or updating my status and whatsoever effin stuffs."
"Even though" is used in the same context as "in spite of the fact that.." or "despite the fact that..."
I'm not completely sure on this, though. Your sentence is a little difficult to understand.
It's also crucial that you place commas before conjunctions that join two or more sentences together, otherwise your sentences become a mess to read.