When you get there, you can say O Hai! and everyone will LOL.

Flickr has a little thingy on their landing page for subscribers and at the top they "say" hello in any number of different languages. For example, it will say "Selamat stengah hari Noodledaddy" at the top of the page followed by "That's how to say good afternnon in Malay" On Wednesday, my landing page read "O Hai Noodledaddy! That's how to say hello in LOLspeak."