The Sun report that Paris Hilton and Travis Barker "tongue kiss" each other to say hello.
Paris has been repeatedly linked to Travis because photos of them kissing constantly emerge. But Travis insists a snog from Paris means you’re just friends.
He said
"Paris and I have tongue kissed before. It's not unusual for me to say hello to Paris and kiss her, but it's not like we are a couple or anything. When we see each other, we say hello. That's it." 
But Shanna Moakler, who marriage to Travis is now over, thinks it's wrong. Saying
"I saw pictures of him trying to stick his tongue down Paris's throat at the mansion. It was in very poor taste." 
Now every country has different ways of greeting friends, some air kiss (so makeup wont get smudged), some hug, some offer a handshake, others rub noses , some even kiss on the cheek 3 times - but I've never been to a country where a friend has tried to stick his tounng down my throat to say hello. Maybe I'm going to the wrong countries ......!