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They most likely use simple forum discussions to conduct the buy/sell between their members. We use a separate software, that is designed to do just that.

There are plenty of other forums...

Yes, you can convince the people who write the tapatalk to include support for photopost classifieds in their next tapatalk release.

I don't think there's a big chance of that happening, but not...

That is a problem with tapatalk - it supports only the basic vbulletin functionality and not additional software such as the classifieds we're using.