I think I mentioned this on here a couple of years ago, but I was in CE on a sparsely populated ex-EU service when the CSD came over for a chat and asked me whether my subsequent flight to Singapore was connected to me giving a conference presentation associated with my job, which he knew quite a lot about! After a bit of banter, he admitted to having Googled me and a couple of other passengers before the flight and digested enough of my public web profile to personalise the conversation in this way. I was pretty confused at the time, but, with hindsight, I was quite impressed and appreciated his efforts. I can well imagine, however, that some passengers might not be so keen on the crew acting in this way.