Team collaboration, or competing?

When reading about social media strategies today, I stumbled across follow excerpt:

In most big companies, IT, digital, marketing and sales not only don’t work together, they compete with each other. Until they start collaborating as a team, you will not succeed in social media.

If you’d change the last two words from “social media” to “business”, the statement, sadly, remains the same.

My home country’s Coat of Arms states “Eendracht maakt macht” (roughly translates to Unity makes strength). Aside from also being Brooklyn’s motto, it should be on several company’s mindsets.