Best Twitter Profiles & Blogs for Data Analysis

So in my final blog of the year I'm putting out a call for the best and most practical resources for data and analytics professionals to follow. I'm looking for the best:

• Twitter profiles
• Blogs
• Newsletters
• Groups

Really anything that you can follow and share information with about data and analytics. Specifically the following:

• R
• SQL
• Python
• Visualization
• Data
• Analytics

Help me become smarter and therefore a more active part of the community of advanced analytics.

Tweet your resources @haizman. Thanks!