I thought the same ( I have abandoned my account), but I saw the mono community grown (link below) in a few hours. I think that Facebook is more for enterprises and G+ could be more of a tool to connect developers. At least this is the tendency.
https://plus.google.com/u/0/communities/107924577343676813218 Juan M Gómez @_jmgomez_ Software Engineer 2012/12/12 [TA] Raffaele Rialdi <raffae...@vevy.com> > Is really anybody using G+? <g>**** > > Seriously, it looks like a desert, would not be easier to get people on FB? > **** > > ** ** > > My 2 cents >