We turned on Chatter but feed tracking on the object name was not disabled prior to enabling it. I have since unchecked the object name on the feed tracking, but I would like to be able to delete these auto-generated posts. I have tried to export the chatter posts using data loader (feed item object), but they don't seem to be exporting. Is it possible to bulk-delete these?
Yes it's possible to export records in the 'FeedItem' object, I had no trouble doing so. As an example, you can filter the records using the following fields:
type= 'Tracked Change'
If you want to export feeditems related to cases use: parentId starts with '500'
Or if the relevant feeditems are related to accounts use: parentId starts with ' 001'
Each object has a different prefix...
You can then delete these FeedItem records using DataLoader.