As far as I know, you cannot use the Google+ API to post to your Google+ Pages, only to your profile.
So, the question is, how can JetPack post to your Google+ Pages on the wall(stream)?
How is that possible? Do they have some exception from Google?
As far as I know, you cannot use the Google+ API to post to your Google+ Pages, only to your profile.
So, the question is, how can JetPack post to your Google+ Pages on the wall(stream)?
How is that possible? Do they have some exception from Google?
There is no public API to post to a Google+ Profile or Page.
There is, however, a limited access API which allows a small number of companies to let its users post to a Google+ Page (but not a Profile).
I don't know if JetPack is using this API directly, or if it is working through a company that does have access to the API.
These few companies were granted special priviledges from Google. Read more here: http://mashable.com/2011/11/15/google-plus-pages-third-party-apps/