I was on a Facebook group where a text conversation had been screenshotted, and someone from the US was very confused about what "xxx" meant on the end of every reply. When explained, they said it was only really used in greetings cards over there. I genuinely thought it was a universal thing!
It just occurred to me that people outside the UK probably think British people (not all) just hand out kisses all the time for no reason. It's true for me personally, as I feel like my texts are way too formal without an "x"!). Bad habit I guess. 