I'm wondering if the chatter:feed component in VF can show a single feed item in that feed rather than the whole feed. That is, a single post that has the All Updates > This Update marker at the top.
The component does use the entityId attribute so it makes sense that it shows the record's entire feed. But it looks like the url for a feedItem takes in two parameters: salesforce.com/a0V6F00000ZOer8?fId=0D55D000003SNb0, one for the record and one for the feedItem.
For context, the use for this on my page is that I have a list of records, each row having a button. The button uses jquery to open a popup window with an iframe of that record's chatter feed (which is just another VF page with chatter:feed). I'm displaying the whole feed, but I only need a single post that has a particular topic.
Any suggestions on other ways I can display the filtered feedItem are very welcome :)