4. Limits and prospects

4.1 Limits

• Differences between platforms

  The first observation we can make is the differences in the data collected and aggregated by the various services and tools. These differences relate in particular to :

  • the number of sources ;

  • the level of detail. For example, Plum Analytics collects Facebook "likes" as well as comments and shares, while ImpactStory collects only shares;

  • values for metrics from the same source ;

  • the number of DOIs collected.

  This can be explained by a number of factors:

  • services do...