An excellent piece of research into this interesting and increasingly important topic. 

If you aren't helping your employees share their knowledge and skills, you aren't helping them and you surely aren't helping yourself.

Take note of the difference between the two lines below. The blue (higher) line is when the employer encourages social advocacy and the red is where they do not. 

And what's the No.1 method to encourage employees... Provide readily accessible tools. 

Now I don't want to be a crashing bore about this BUT it did not escape my notice that Passle ticks pretty much all the boxes in the list below.