For social use, unless you’re a hardened stalker, you don’t go approaching or messaging people on Facebook who you don’t already know. It’s all about communicating with those you do. Or a frantic pursuit of collecting people you've had the vaguest connection to, anyway – could we win gold in this?For business though I want to contact people I haven’t met or who won’t remember me. I want to introduce myself, tell them what I do and see if there’s a way we can work together. However, the only way to do this is to cold message and, well, it all feels a little intrusive.I know Facebook isn't a business network but there's some damn useful people on there, some of whom happily use it for business. Some don't, though - so how do you tell?Do you mind being messaged cold? Or should business talk be kept to business networking sites?