This document discusses a breakout group at the CERN Workshop on Innovations in Scholarly Communication focused on altmetrics. The group aims to make recommendations to improve acceptance of altmetrics. Key issues to be discussed include methodology, data quality, stability, and reliability of altmetrics. Under each issue, questions are posed about how altmetrics measure various dimensions like quality and relevance, how to ensure consistent and verifiable data, and what infrastructure is needed to provide a stable altmetrics service.