Historically and culturally it is Eastern/Central Europe. Generally such divisions in cases when there are no clear boundaries are arbitral
And you base that on... hmm... nothing? I can see no evidence of it historically being recognized as Eastern Europe and culturally Lithuania has a culture of its own. Moreover, even if you could prove the historical and cultural attribution to Eastern Europe (which you didn't), what sense does it make anyway provided we are talking in geographical terms (why say Eastern Europe if it's not in the East and Northern if it's not in the North! - it simply does not make sense that way) and in geographical terms (here, have a look at a map
http://www.google.com/imgres?imgurl=htt ... CCQQ9QEwAA ) - Lithuania is on the same plain with Denmark and since Denmark is attributed to Northern Europe, it would be logical if Lithuania was so too.
„Kaip gyveni?“ isn't a greeting, it can't replace „labas“ and you must be prepared to get real account how someone is instead of formal „ačiū, gerai“(in this case „ačiū, gerai“ is polite form to say "It is not your busines" )
That is a somewhat good point. I would say, however, that it is a greeting to some extent but it's probably less of one as compared to English.
Kuo tu vardu?
Aš vardu... That would be more natural.
Koks tavo vardas? The corect aswer would be ilgas(long), trumpas(short) or gražus(beautiful)
I would disagree that it is more natural. It's just another variant of saying it (I'm not sure where it comes from either). It only applies to names and the adjective-for-an-answer joke isn't funny. Lithuanian uses koks/kokia for "what" questions and you don't say
kuo yra Islandijos sostinė but
kokia yra Islandijos sostinė and still except the name of the city as an answer.