Silence is sometimes the best policy.
Tip #12 – Don’t offer Advice or Endorsement. A big challenge when you know (or think you know) the answer to an issue that appears online is avoiding situations where posting might be construed as establishing a client relationship, providing professional advice or endorsing a product or service. By recommending or endorsing a product or service provider a disgruntled user could seek remedy from the firm. Silence is often the best (as well as the hardest) policy.