It's not completely sorted out but there has been a big progress in just a couple of days:
https://www.mediawiki.org/wiki/Social_media
Summary: follow & like MediaWiki in your social networks to read & promote MediaWiki & Wikimedia tech news.
* http://identi.ca/mediawiki * https://twitter.com/MediaWiki * https://www.facebook.com/MediaWikiProject
These channels pay a lot of attention to critical mass. The more followers and shares/likes the more promoted you get (more or less). Your support is welcome.
See also how we can redistribute your relevant updates: https://www.mediawiki.org/wiki/Social_media#Sharing_your_updates
There are still some details to polish e.g. how to automate the process including Facebook (& Google+) or how to clear the FB mess. If you enjoy social media your ideas are welcome:
https://www.mediawiki.org/wiki/Talk:Social_media