Was doing some testing before launching and when I was done went to clear out all testing data, including deleting all the test users. I wanted Recent Activity cleared out, too, of course, so actual users wouldn't see the testing info.
Support directed me to do a force rebuild of the activity streams by rebuilding the search index in ACP -> System -> Search -> Rebuild Search Index. After that, I still had a bunch of posts about adverts remaining in the Recent Activity list and I had to go through and manually delete the old adverts to get that to clear.
Support suggested I check with you to see why these adverts were left over when content was deleted.
Please advise. Thanks.
EDIT TO ADD: Will this also be an issue when members are no longer members? I don't want promos to be showing in the Recent Activity for them.