Here is a list of some that I periodically follow:
1. The Moz newsletter (
moz.com). SEO focused but occasionally some good social media pieces
GrowthHackers.com: Liked Reddit or Hacker News but for marketers. Uses wisdom of the crowd to surface up the very best articles. Some of the content can get repetitive tedious i.e. How we made X million in Y months, without much substance.
3. Social Media Examiner: As the name suggests, focused on social media