Microsoft's Socl is open for business: http://blog.fuselabs.org/post/37196309164/good-morning-its-a-big-day-for-us
"Facebook is about conversation and brand awareness; pinterest drives sales": http://venturebeat.com/2012/12/05/pinfluencer-pinterest-better-than-facebook-for-followers-impressions-and-sales/
Instagram disables full Twitter integration to drive users to its website: http://bits.blogs.nytimes.com/2012/12/05/twitter-loses-ability-to-properly-display-instagram-photos/
"Serious 'social blindness' at the topmost levels of business" http://pro.gigaom.com/blog/stanford-social-media-research-shows-huge-shortfall-in-social-media-use-by-execs/
And in case you missed it, the Instagram/Nickleback parody: http://www.collegehumor.com/video/6853117/look-at-this-instagram-nickelback-parody