Can any one tell me about this: Is it better to have one domain for all languages i.e.: yubuk.com/de, yubuk.com/en and yubuk.com/it or is better to have it like yubuk.it, yubuk.de and yubuk.com?
If your main site is a dot COM then it is better to build that site and use one domain for all languages. If you domain is not a dot COM and you can get the most popular TLD in the country you operate that in, then do the same with that TLD.
If the business model/size permits it, you should definitely opt for cornering all the targeted country specific tlds as well. It would help you give localized touch to your efforts! Regards, RightMan
domain name extension is important thing for choosing a domain. .com, .us, .gov and .edu is most popular extension.