[quote]Maybe it's about definitions. To an American, "being friendly" means, above all, smiling; we are also expected to use a pleasant tone of voice and be willing to chat briefly with a stranger. That's it and nothing more. When a restaurant is described as having friendly service, the reviewer doesn't mean the waiters become socially friendly with the patrons. Perhaps to other nationalities "being friendly" means a willingness to make friends - real friends - with many people. That's not the American way.
[quote]People who come from cultures where you only smile and chat with people you want to get to know better find this "fake", but there's no false intention behind it. It's our way of being "nice", which is a highly valued trait in American culture. Anyone taking such friendliness as an overture to true friendship is bound to be disappointed because we don't readily befriend strangers here.
The points about Americans in R148 and R182 are insightful, but I would add that Americans talk a great deal about friends and friendship out of all proportion to reality. I used to think the effusive suggestions that "I just know we're going to be the best of friends!" was a syrupy sweet Southern thing (the old adage about a Southerner being famously quick to invite you to their house -- and famously slow to reveal his address), but I see Americans from all over do it with foreigners often, even more than with fellow Americans. And not just in the context of being introduced to someone at a party or a casual conversation among strangers who engage in some sort of conversation in a public space. Surely this is well (if hollowly) intentioned as a sort of welcoming gesture, but its easy to see why a lot of Europeans like Americans at first and then dismiss them as "fake nice."
Europeans have larger, broader networks of friends and depending on where they are from they make time for friends in ways that seem odd to Americans. A Mediterranean who runs into a casual acquaintance in the street may invite the other (and any friends or family in tow) for a drink; and actually be disappointed if the other cannot join him. An American in that situation would more likely bare his teeth in a big glitteringly white smile and say "Hey, great to see you!" without slowing down for even half a second. Closer friends an American may stop for, but fleetingly - there's always some dry cleaning that has to be picked up, so shopping that couldn't possibly wait, some place one has to be. Americans have very segregated sets of friends: from work, neighbors, friends of friends, people they see repeatedly in some other context, and somewhere a small core group of friends for whom they actually care a bit, but for all but they last they will lavish the exaggerated pleasure signals and best frenemy platitudes and vague plans to make some vague plans that never happen and then flee as if they had left something cooking on the stove at home, always in a hurry to conclude and dispense with all of the people they are so very glad to see.
Americans don't make friends easily or suddenly, but they do make a huge great show of how friendly they are. Not just helpful, but friendly - or rather friendly appearing. That is what puzzles foreigners other people unaccustomed to such effusiveness at a purely surface level. (Why was that woman fawning over me all night at that party? And why is it that she barely nods when I see her on the street after?) It's a small wonder that Americans find everyone else is unfriendly (or some degree of French, maybe), or that they feel neglected when the residents of other countries fail to stop everything and gush over how lucky they are that Americans have deigned to visit their quaint lands.