How to delete SharePoint 2013 MySite UserPosts

Question

I've created a new web application (e.g. bloggler.myspfarm.com) on my SharePoint 2013 farm and set up my site and it worked fine. I sent 2 posts on mysite. After that I removed this web application using central admin and create a new web application (e.g. mysite.myspfarm.com) with a different name and set up mysite and it works fine again. But here is the problem, I can see my previous post on my user profile page but I can not delete this posts. I can see little X icon on post, I can click it and click "remove post" button and delete it but when I refresh the page posts come back. Is there a way to delete this posts using PowerShell?

Shortly, how can I delete a post in mysite newsfeed using powershell?

When I try to reply post, I'm getting this

Microsoft.Office.Server.Microfeed.MicrofeedException. Internal Error Code: 26. 

According to here it means

MicroBlogList_Error_FetchingItem

Answer 1

I would try resetting the Feed Cache. Run the following cmdlets in this order:

Update-SPRepopulateMicroblogLMTCache -ProfileServiceApplicationProxy <proxyid>
Update-SPRepopulateMicroblogFeedCache  -ProfileServiceApplicationProxy <proxyid> -AccountName domain\youraccount

Reference: Manage Feed Cache