Howard Bashman at How Appealing muses whether anonymous blogging is really possible:
These days, however, most users of the internet understand that every bit of information communicated electronically leaves electronic fingerprints that can be used to trace the source of the information, even if the source hoped to remain anonymous. To be sure, there are ways to anonymize emails and other forms of communication, but they tend to be complicated to use and difficult to figure out. . . .
I doubt whether anonymous blogging is possible. It surely isn’t possible if the blogger conducts email correspondence with others and fails to mask his or her internet protocol address. Plus, even the act of logging on to a blogging service provider, such as TypePad or blogger, leaves electronic fingerprints, and I’d have to assume that “UTR” had a TypePad subscription, enabling someone to subpoena the blog owner’s identity and/or payment information. So, to you anonymous bloggers out there, have fun, but don’t fool yourselves into thinking that simply by not providing your identity you are doing an effective job of remaining hidden.
I generally agree that it is very difficult to blog anonymously, but it is certainly possible if a person is careful.