We only grab a maximum of 50 tweets per API call so if there were more than 50 new ones between the last call and this one, they will be skipped over. This feature is really designed to track mentions of you and/or your service / website, and for customers using it for this purpose, most of them will not be affected by this. However, some customers setup fairly generic searches for their market/vertical; it is these kinds of searches that will generally be most affected by this.

Taking that into account, Twitter still does not guarantee that all tweets will be provided by their search API. So even for low volume searches, we cannot guarantee that all tweets matching a given search will be reported by Clicky.