Document the filtering rules for the search API
The freely available search API would be a great tool for research, but given that not all tweets are included (even in the ~7 day window), it can rule out certain types of studies, because it is not clear whether or how the search indexing rules might bias the sample.
To address this for academic research it would be great if the rules and approach for what is not indexed and why it is not indexed were clearly documented in a way that researchers could make decisions about appropriateness for their work.
