Is easy to know when a non english speaker is writting?

Yeah, a post from a non-native English speaker is usually easy for me to spot.  Not that this is a bad thing, though.  I enjoy & appreciate the sometimes off-beat syntax and left field word choices a non-native speaker will put on the page.  It adds style & pizzazz.  It adds flavor.  And of course, the various regional accents of English (American, Brit, Aussie, etc.) are often apparent, as well.

Once upon a time I wanted to be a Linguistics professor.  I actually got an M.A. in the discipline before my life made a thoroughly enjoyable left turn.  At any rate, my masters thesis focused on English Grammar.  And lemme tell ya.  When it comes to grammar, English is a veritable rats' nest.

Yeah, spelling can be pretty appalling in chat room postings.  The way I see it, though, it's damn near impossible to de-flack all the 'corrections' offered up by happy-go-lucky spell-check software.  Then there's the miserable keyboard choices available on today's laptop & other portable devices.