blogs and blogging seem to be basically similar in content. In principle, the former could be about reading blogs and the latter writing them, but I doubt that distinction would survive. Also, blog is already a synonym for blogging. I suggest making blogs a synonym for blogging.
updating post history, 89 rows affected updating posts, 69 rows affected updating PostTags associations, 32 rows affected removing/renaming old tag, 1 rows affected updating count for master tag, 1 rows affected tag remapping of [blogging] and [blogs] complete! Tag Synonym blogs -> blogging was approved!