Khan,
Despite my suggestion of using a blog, I must admit I would be quite nervous about having internal company discussions on blog, even if it was an externally hosted private blog, but I know some companies who do it.
I think the VPN solution is the way to go, accessing some sort of discussion board behind your firewall (as suggested by MOZ), although a bit more complex it would be quite secure.
Otherwise I think your options are limited to voice/video, again as already suggested.
Kevin
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