Regarding content serving

when an specific area viewers see different language version

[billy_t9]

Till now I was having a trilingual site (english-italian-german).
where someone could reach the appropriate language from a url of this structure...
www.abcd.com/english
www.abcd.com/italian
...............
leaving the default url abcd.com under my main visitors language.
What problems I might face if I force the default url to show according to the area someone visits my site?
Please help me as I thing Google (I am refering to this as more that half of my search engine refferals are from ggl) might face this as spamming or not good way to promote my content .

Or to force them through redirection to go to the appropriate language page?

[mavherick]

So you're saying that www.abcd.com/index.html will be different depending where the visitor is from? (how are you going to implement that part?)

The question I would ask myself is how can you feed 3 different pages (languages) to the spider through one url? Personally, I would go for subdomains (maybe paynt could help you out with canonicals as she call them).

[billy_t9]

Already have 3subdomains
www.abcd.com/english/ for english
www.abcd.com/italian/ for italians
www.abcd.com/german/ -//-

and my default home page was a mirrored of the english one.

Now I have decided to keep the rest of the 3 subdomains and the main url to show according the visitors IP the content of the appropriate language.
I want to know for not to be considered as a spammer if it is ok to implement it.....

[ciml]

Google do this themselves, but IP based redirection can be dangerous in Google.

I would hope that you would not be harmed by human review, but Google don't like 'sneaky redirects' so you don't want to look like you're doing that as far as automatic penalties go. Googlebot confusion is also a possibility, the most likely affect is that some of your PageRank gets lost.

You should read around the forums here about non-Google implications of doing this. It annoys some people, and I'd expect IPs not to predict language as well as the browser headers.