Yes, especially when the greeting is in either English, Chinese, or Spanish ( these languages I am more comfortable with, please don't confused with nationalities)

yeah, of course. especially when the motive is clear (i.e. learning, learning and learning). :)

" Do you like chatting with newcomers?" and i love it!!! because i remember when i was one and i felt SO clueless!! .. so if you are a newcomer welcome!!! and feel free to ask for help any time :) ~nicamamii~

i like ,because me too .so we(someone and me) can chat together.

Hmmm, 'chatting up 'is definitely not the right phrase to use as Erik said. I have to agree with Romulus as well.