How to like /unlike social feed in sharepoint using SSOM

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SharePoint

Below is the issue i am getting while try to like any SPSocial Feed.

"Microsoft.Office.Server.Microfeed.MicrofeedException. Internal error code: 28".

My Code is Working perfect in Console application but in webpart is't not :(

Please look into sample code to get detail about the issue.

const string siteUrl = "http://server/sites/sitename";
            const string user = "domain\\username";

            using (SPSite site = new SPSite(siteUrl))
            {
                SPUser userContext = site.RootWeb.SiteUsers[user];
                SPUserToken userToken = userContext.UserToken;

                SPServiceContext serviceContext = SPServiceContext.GetContext(site);

                using (new SPServiceContextScope(serviceContext))
                {

                    UserProfileManager profileManager = new UserProfileManager(serviceContext);

                    UserProfile userProfile = profileManager.GetUserProfile(userContext.LoginName);

                    SPSocialFeedManager feedManager = new SPSocialFeedManager(userProfile, serviceContext, userToken);

                    SPSocialPostCreationData post = new SPSocialPostCreationData();
                    post.ContentText = "Hi from server object model";

                    feedManager.CreatePost(site.Url+"/newsfeed.aspx", post);

                }
            }

What I have tried:

Already tried with
SPSecurity.RunWithElevatedPrivileges
SPUtility.ValidateFormDigest();
WeB.Allowunsafeupdate