Which cms to choose for team blogging with map service integration?

Question

CMS

Hello, I'm looking for a suitable cms for team blogging (well, I'm sure about the correct translation). It is necessary for users to be able to create posts with inserting photos, and linking posts to certain countries/points on the map. General post feed, rating, comments, global post map .
I would like to speed up development using cms. But since no experience in using cms yet, I would like to get your advice.
I can write in java, php, but I'm even ready to learn a new language to simplify development.
While the choice falls on Pigg cms, also as a variant of Livestreet cms.