Installed Plugoo last week on our client login area – it allows visitors to your website to contact you via Messenger, without them knowing what your actual messenger signin is.
Actually, they don’t even know what IM software you’re using!
It’s all pretty seamless and appears to work quite well.
The only real gripe is that if you embed the object on the page, once the visitor navigates away from that page the conversation ends. Makes continuity a bit hard. I’ve overcome this by placing their object in a hard-coded popup window, and made a little ‘live help’ button instead.