At the beginning I had some problems with the jetpack plugin for wordpress, specifically publicizing the post to my facebook account. With magic this seems to be solved now.
Also the connection to LinkedIn and Google+ is working, although I had to configure the wordpress app in the Google+ account to share the post to all the groups via https://plus.google.com/apps
Even the posting via the mobil app worked, although I could not select, as in the web based interface, to which targets the post is publicized.
