I have a blog site set up in Office 365, SharePoint Online, internally (not on the public site). I only want a few people to be able to post and manage content, so I have a group set up as contributors. The typical user should only have read access, but I also want them to be able to comment on individual postings. If the Everyone group has Read access, they can "Like" postings, but cannot add comments. I don't see a permission level that will allow them to comment but not allow them to create new posts. Any ideas on how this can be accomplished?