In the Philippines, the intersection of social media and personal reputation is governed primarily by the Cybercrime Prevention Act of 2012 (Republic Act No. 10175) and the Revised Penal Code. Navigating the legal landscape to seek redress for online abuse requires an understanding of the specific crimes involved, the evidence required, and the procedural steps for filing a formal complaint.

1. Understanding the Legal Grounds

While "cyberbullying" is a common term, it is often prosecuted under specific penal provisions depending on the nature of the act and the age of the parties involved.

Cyber Libel (Section 4(c)(4) of R.A. 10175): This is the most common charge for online defamation. It refers to a public and malicious imputation of a crime, vice, or defect, real or imaginary, or any act, omission, condition, status, or circumstance tending to cause the dishonor, discredit, or contempt of a natural or juridical person, committed through a computer system.
Unjust Vexation: Under Article 287 of the Revised Penal Code, any human conduct which, although not productive of physical injury, would unjustly annoy or irritate an innocent person, can be classified as unjust vexation. This is often used for persistent online harassment that does not reach the level of libel.
Safe Spaces Act (R.A. 11313): Also known as the "Bawal Bastos Law," this penalizes gender-based online sexual harassment, including uploading or sharing photos/videos without consent, or using nicknames and slurs to ridicule a person based on their sex, gender, or sexual orientation.
Anti-Bullying Act of 2013 (R.A. 10627): This applies specifically to student-on-student bullying within a school context. If the parties are minors in an educational setting, the school administration is mandated to take the first step in the intervention and disciplinary process.

2. Elements of Cyber Libel

To successfully prosecute a case for Cyber Libel, the following four elements must be proven:

Allegation of a discreditable act or condition: The statement must be defamatory.
Publication: The statement was seen or read by a third person (e.g., posted on Facebook, Twitter, or a public group).
Identity of the person defamed: The victim must be identifiable, even if not named directly (e.g., through clear descriptions).
Existence of Malice: The perpetrator acted with an intent to injure the reputation of the victim.

Note on Penalty: Under R.A. 10175, the penalty for Cyber Libel is one degree higher than that prescribed by the Revised Penal Code for traditional libel. This can result in imprisonment (prision mayor).

3. Essential Evidence to Gather

Digital evidence is volatile and can be easily deleted. Immediate preservation is critical.

Screenshots: Capture the defamatory post, the profile of the perpetrator, the date/timestamp, and the URL. Ensure the comments section is also captured if it shows the "public" nature of the post.
Device Capture: If possible, record a video of yourself navigating to the post to prove the content is live and not a manipulated image.
Witness Statements: Statements from individuals who saw the post and can testify to how it affected the victim’s reputation.
Preservation of Links: Keep a record of the direct permanent links (URLs) to the offending content.

4. Procedural Steps to File a Complaint

Step 1: Reporting to Law Enforcement

You may bring your evidence to either of the two specialized units in the Philippines:

PNP Anti-Cybercrime Group (PNP-ACG): Located at Camp Crame, Quezon City, or their regional satellite offices.
NBI Cybercrime Division (NBI-CCD): Located at the NBI Building in Manila or regional offices. These agencies will conduct an initial investigation and help verify the identity of the perpetrator, especially if they are using a pseudonym.

Step 2: Filing the Formal Complaint (Affidavit-Complaint)

Once the perpetrator is identified, you (with the help of a lawyer or the investigating agency) will prepare an Affidavit-Complaint. This is filed before the Office of the Prosecutor in the city or province where:

The complainant resides at the time of the offense; or
Where the offending post was first accessed by the complainant.

Step 3: Preliminary Investigation

The prosecutor will issue a subpoena to the respondent (the bully), requiring them to submit a Counter-Affidavit. The prosecutor then determines if there is probable cause to bring the case to court.

Step 4: Trial in Court

If the prosecutor finds probable cause, an "Information" (the criminal charge) is filed in the Regional Trial Court (RTC) designated as a Special Cybercrime Court. The case will then proceed to arraignment and trial.

5. Important Legal Considerations

Prescription Period: In the Philippines, there is ongoing legal discourse regarding the prescription period for Cyber Libel. While traditional libel prescribes in one year, some interpretations suggest the period for Cyber Libel is significantly longer (up to 12 years) due to its classification under a special law. However, acting within one year of discovery is the safest legal approach.
Civil Liability: Aside from criminal charges, a victim can also file a separate civil action for Damages (Moral and Exemplary) under the Civil Code to seek financial compensation for the emotional distress and reputational harm caused.
Liability for Sharing: Under current Philippine jurisprudence (notably Disini vs. Secretary of Justice), "liking" or "reacting" to a defamatory post is generally not punishable. However, creating a new post that re-publishes or re-affirms the defamatory content can potentially lead to liability.