The gateway drug to enterprise information silos
We were all warned about the danger of gateway drugs. Just one moment of indiscretion using Bad Thing X would undoubtedly lead you into a lifetime of abuse of Bad Thing Y, which would eventually ruin your life. After that, you might start skipping school, join a rock band, get a tattoo or drive off in a Volkswagen Beetle for the summer with no distinct purpose.
The same rule applies in enterprise software, where lightweight native social features inside purpose-built business applications are Bad Thing X. Today, there is a real problem threatening companies attempting to become a truly social business: lightweight social features baked into purpose-built software are the gateway drug to collaboration failure.