@dragnucs@quitter.no Both AndStatus and GNU Social support HTML markup in a message body. This means that you can construct a post, which will be human readable plus it will have all necessary metadata hidden in HTML elements and attributes.
Then at a client side you just need to add custom "Message editor" for such special posts. That message editor will retrieve metadata from incoming post, render your poll or checklist and construct a "Reply", which, similarly to original post, will create nice HTML representation to be seen by people on any client application and hide all metadata in HTML markup for automatic parsing...
We may think about a plugin for AndStatus, which will add such additional semantics to special posts...
?!