You can apply for and use an International Standard Serial Number for your Weblog. Your blog will then officially exist in the worldwide standardized encyclopedia of periodicals. A serial does not have to be printed.
Electronic serials qualify as such.
Electronic serials that are issued as individual articles meet this criterion as long as the articles carry a unique designation. Thus, a database issued quarterly on CD-ROM and carrying quarterly date designations would be eligible for an ISSN while the same database as an online service which was being continually and seamlessly updated would not be eligible. Canada doesn't, for example, and even the U.S. probably isn't strict about it if your archives have discrete filenames. Note also the explicit inclusion of memoirs in the definition. Weblogs are clearly Weblogs.