Create an organization news site
To specify sites as "official" or "authoritative" for news in your organization, mark them as organization news sites. These posts get special visual treatment (see the "NEWS @ CONTOSO" color block below), and appear on the SharePoint start page.
When SharePoint home sites are released, they will be automatically configured as organization news sites.
Use Microsoft PowerShell to specify a site as an organization news site
If you installed a previous version of the SharePoint Online Management Shell, go to Add or remove programs and uninstall “SharePoint Online Management Shell.”
On the Download Center page, select your language and then click the Download button. You’ll be asked to choose between downloading a x64 and x86 .msi file. Download the x64 file if you’re running the 64-bit version of Windows or the x86 file if you’re running the 32-bit version. If you don’t know, see https://support.microsoft.com/help/13443/windows-which-operating-system. After the file downloads, run it and follow the steps in the Setup Wizard.
Connect to SharePoint Online as a global admin or SharePoint admin in Office 365. To learn how, see Getting started with SharePoint Online Management Shell.
Run the following command to designate the site as an organization news site:
Set-SPOOrgNewsSite -OrgNewsSiteUrl <site URL>
Set-SPOOrgNewsSite -OrgNewsSiteUrl https://contoso.sharepoint.com/sites/Marketing