Microsoft has a problem with word of mouth
I remember when So.cl was launched, it was mentioned here on El Reg.
But absolutely nothing since until now, here on El Reg.
In fact, the only MS products I ever heard about from friends/family were:
Vista (such language! <tsk>)
Zune (nothing good)
Win7 (everyone was laughing at the party hype release)
Win8 (see Vista above)
Win10 (see Vista above)
Apparently, MS marketing has a certain touch... the touch of Death, when it comes to marketing to the masses