I've been working (with Sharon) on setting up an ATP pinterest account, so I hope you follow us there as well!
As for pinning ATP content, yes- of course we want you to do that
The wonderful thing about Pinterest is that the original copyright remains with the owner, and the pins link back to the original content. The exception to this might be in the database where the copyright is with a third party. We have permission from dozens of companies for the use of their photos on ATP, and that's where pinterest's waters get rather murky. Still, the copyright does remain with them, although we don't know that they want their pictures shared.
So, with that said, pin and share away!