While everybody enjoys compliments on their looks, focusing too much on physical looks seems to imply shallowness.Messages using words like will more often than not end up getting deleted immediately.Better to focus on interests, or even better, common interests. Talking about your own interests can give the recipient a good idea of what you are like.
So while you should avoid using netspeak too much, using slang or an unusual greeting is considered a great move.
Strange how in the world of dating we have always been told that self confidence is extremely attractive, but the opposite holds true with regards to online dating.
Putting yourself down or being a little shy or awkward can come across rather endearing.
You could always spruce it up a bit and go with a foreign greeting, but make sure you know what it means otherwise you could come off looking like a bit of a Del boy.
Theirs might be the most beautiful smile in the world, but pointing that fact out in a first message will most likely be a turn off.
Online dating gives you a bit of an advantage in that you can strategically plan that first message so it hits home with a bit of a punch.