BlackBerry sues Twitter over messaging patents

BlackBerry on Wednesday sued Twitter, alleging it infringes on several messaging-related patents.

The big picture: Having seen its once-popular BBM service fade from the messaging scene, BlackBerry has launched a series of lawsuits against today's leaders. Last March, BlackBerry sued Facebook, along with Facebook-owned Instagram and WhatsApp. A month later, it sued Snapchat's parent company.