What is a limitation associated with Altmetrics.com?

The limitation associated with Altmetrics.com is that it misses mentions of articles published before a certain date. This is significant because Altmetrics focuses on the online presence and engagement surrounding scholarly articles, and as such, it may not capture the full impact or reach of articles that were published prior to its tracking capabilities. This means that any metrics or data collected will omit potentially relevant discussions or mentions of older works, which can lead to an incomplete understanding of an article's influence in the academic community and beyond. The ability to track media mentions, citations, and social media interactions is dependent on the article being within a certain time frame post-publication, thus limiting the historical context in which some articles may be discussed. This limitation emphasizes the need for comprehensive citation analysis methods in conjunction with Altmetric data to fully appreciate the impact of scientific literature over time.