Twitter starts filtering DMs from people you don't follow

For a very long time Twitter's been trying to make its Direct Messages (DM) functionality into a person-to-person messaging system that people will actually use on a daily basis. You know, like Facebook Messenger or WhatsApp. Given that it hasn't yet shared usage numbers just for this feature, we assume it hasn't succeeded yet. That, however, isn't stopping it from adding ever more improvements to the DM system. Case in point: today, the company announced a change in how some DMs are handled. If you have opted in to get DMs from anyone (and not just people you follow, which is the...