I currently monitor mentions of politicians’ @usernames and certain keywords using statuses/filter. I recently noticed an issue with my data this past month (possibly earlier) where retweets are not showing up in the stream. The volume of data on the days that I discovered was not very high, so I am not sure why the retweets are not being returned. It seems unlikely that I would get zero retweets for certain tweets especially on low-volume days.
For example, since May 22nd 2015 I have only received 0 - 6 retweets/day for @NajibRazak. But looking at his timeline there are thousands of retweets that have not shown up. For today (June 5th) tweets alone I only received 5 retweets in the stream but there should be thousands.
Is this normal? Would using the ‘follow’ parameter or Search API help to get the missing retweets?