If you want to start internal blogging community in your organization for employees, where each member will have its own page to blog something. You should give each member a unique domain such as member.yourdomain.com.
You should use Word-Press for your blogging community. For this You need to create sub-domains and install WP on each sub domain.
1] Login to Word-Press cPanel >> Select Sub-Domain option.
2] Create Sub-domain (member.yourdomain.com) >> Once sub-domain created >> Go-Back to Main Control Panel.