There has been a recent spike in the number of Announcer badges being awarded on TeX.SE. A query on SEDE highlights this:
The last four months saw the occasional awarding of more than one-a-day, with April 2017 shooting up to 3+ per day.
Similar increases or spikes seem to have occurred on SO, SF and SU.
Can anyone shed some light on this? Was there any changes in the back-end that caused this?