TITLE: What are some interesting blogs about general topology?
QUESTION [9 upvotes]: We have several question asking about book recommendations for general topology - for example the posts linked to Best book for topology? or the posts mentioned in the relevant section  of http://meta.math.stackexchange.com/questions/1868/list-of-generalizations-of-common-questions. These posts range from beginner level books to a comprehensive reference.
Are there also some blogs that would be useful for somebody interested in general topology? I am interested in blogs intended for audience of any level, from beginners to research level.

REPLY [5 votes]: Dan Ma's Topology Blog
From the blog's about page:

This blog is not intended as a research blog. The focus is usually on fairly basic topological notions – normal spaces, compact spaces, [Lindelöf] property, metrizability, product spaces, and function spaces, just to name a few. I tend to write on topics or problems or examples that interest me. But there is a lot of contents in my blog that are geared toward readers taking courses in topology.