Abstract: An online monitoring system assists parents or other individuals in monitoring social networking activity and/or mobile phone usage of their children or others. The online monitoring system may gather data corresponding with monitored social networking and/or mobile phone accounts. The data may be analyzed to provide summarized information and alert notifications to parents or other individuals. The analyses provided by the online monitoring service may include several text-based analyses: keyword analysis, sentiment analysis, and structure analysis. The keyword analysis may include analyzing text to determine whether it includes any blacklisted or whitelisted words. The sentiment analysis may include determining an overall sentiment of text based on the sentiment of words within the text. The structure analysis may include analyzing the sentence structure of the text to identify grammatical parts. An overall structure score is determined based on the sentiment of the grammatical parts.