Which feature is critical for users wanting to analyze their survey data in-depth?

The ability to export data in formats like CSV is essential for users looking to conduct an in-depth analysis of their survey data. This feature allows users to easily move data into statistical analysis software or spreadsheet applications for advanced processing and visualization. The CSV format is widely compatible with various tools, enabling users to perform complex analyses, segment data, and visualize results according to their specific needs.

The other features, while beneficial in their own right, do not directly support the in-depth analysis of survey data. Customization of survey themes focuses more on the survey's appearance and branding rather than the data analysis process. Integration with social media platforms enhances outreach and response collection but does not aid in analyzing the collected data itself. In-built survey response tracking helps monitor responses over time but does not provide the versatility and depth of analysis that exporting to a CSV format does.