Do people who work for SAP use SCN to collaborate internally or do they use another platform?

Hi - I've been reading about the SCN as an example of brilliant collaboration - but wondered, is it used by internal teams at SAP as well as external folk?

And also, does anybody know how many people use SCN?

I'm trying to find an example to inspire how platforms like this can create collaboration in organisations - internally and externally.

Thank you!