public IEnumerable <PostDto> GetFollowingUsersPosts(string userName)
{
var followingUserNames = _profileService.GetFollowing(userName).Select(p => p.UserName);
var followingUserPosts = _postProvider.GetFollowingPost(followingUserNames).ToList();
followingUserPosts.Sort((x, y) => DateTime.Compare(x.CreatedAt, y.CreatedAt));
return(followingUserPosts.Select(p => _mapper.Map <PostDto>(p)));
}