sorry for the late response. Regarding your question, I am working hard these days to finish the data recording feature. So you can use dashboards even with not connected devices. It is almost done, but it needs some testing. I will send an email when it is done!
Sharing dashboards is not currently available. I must think on how to effectively implement that feature, as it can involve letting third people accessing your devices or data buckets, and it can become a security problem if it is not handled correctly.
No problem with your english. Mine is not perfect btw I understand you.