Can any compact format fullfill this need really well ??

I do not know if he will see/respond to this thread but Ray is one of the guys that shoots with multi brands (and shoots extremely well .

http://www.dpreview.com/members/9979294488

You can take a look at his past posts.

How important is speed of posting to Facebook etc? You could checkout any of the newish compacts with wi-fi or even some of the latest 'Smart' mobiles.

Just sort of looking at options

Edit: I've seen some great low light shots with the Fuji X100 but a single lens 35mm just did not work for me. Super quiet shooting .
Cheers,
--
Anticipate the Light and wing it when you get it wrong

Tom
http://taja.smugmug.com/