Libel cases, the question is not what the writer of an alleged libel means, but what the words used by him mean. Jurisprudence has laid down a test to determine the defamatory character of words used in the following manner.
It was clearly stated there that libel considers the words that was used written or said. The following statement will undergo in a test to determine the words that was used in defamation.
Article 355 of the Revised Penal Code says that libel may be committed by mean of writing, printing, lithography, engraving, radio, phonograph, painting, theatrical exhibition, cinematographic exhibition, or any similar means.
You can defend yourself in this case by using evidences that what you published is true, even though it is libelous. You can also prove that you published it with good intention and for justifiable ends, the defendants shall be acquitted.
This law is applicable in blogging. Since you are publishing information, if someone who is involve in your blog found it libelous then he/she can file this case against you. This case is a reminder in being responsible in using words in their statements especially if there are other people involved.