@ Steve Davies 3
> I am sure it won't be long before someone is refused entry to the USofA because they don't say anything on Twatter, FaceBlock etc.
I'm quite sure of it, too. They recently (~ 1 year ago) added an "e-mail" field in the border paperwork; although they do not strictly enforce it, I was once sent back to the back of the line to fill the field that I had left blank. The field is something like 12 char. in lenght, too, talk about stupid. I crammed my longest email addy in there (well in excess of twice the lenght of the field, so it ended up scrawled around the margin) and they let me go. 2 weeks later I had to nuke the account as it was overrun with spam (I hadn't used it in years and it was pretty much dead anyway, including no incoming traffic; not even spam anymore).
On a separate occasion I spent 10 minutes explaining to the too-stupid-to-be-mall-security guy why a 30-something like me had no cell phone (ten minutes can be a very long time in some circumstances).
Although a lot of the time it's just a matter of bad luck and personal incompetence from the very guy you're talking to, not a general conspiracy. For example I was almost denied entry once because I hadn't submitted the internet entry form 72 hrs in advance (can't remember the name). I spent ages explaining that because I have a bona fide visa I don't have to; and in fact the system probably wouldn't let me fill one. I mean that's their own guidelines. The form I have to fill is not the same as for the people who have a visa waiver. In fact it's not even the same _colour_! But no, the guy wasn't able to see the difference, and wanted to refuse me entry. I only got in because I insisted "too much" and the colleagues he called to physically remove me were a bit less thick than he was.
I must say that most of the time I go through quite easily though, even if there is a clear correlation between the way I'm dressed and shaved and the probability to go through a "random" search (well-shaven, proper shirt is good; 3-days beard, jeans, T-shirt and old denim bomber is bad). But that's security, not customs.