what does the "sync person updates to sfdc" activity under the activity log actually signify?
Example (highlighted in orange)
Does that mean Salesforce initiated a sync automatically? I'm leaning towards "no" because I know the SFDC sync happens every 10 minutes, and I don't see anywhere near enough of these activity types to think it was that.
I don't see any "campaign name" associated with this activity type, so I'm guessing it must be some sort of system update.