Hi, these posts are made to keep the Share2Steem account "alive" and to try and stay in touch with all active communities using the application (hence the different languages, there will always be english though).
We could use another account, the problem is that the goal is also to get some upvotes to "build" up the proprietary SP on the @share2steem account.
We always did it like that : once a week approximatively, an update post concerning the application, and the rest of the time, little post to remind people that we "exist" and that they can use our application (visibility purposes).