Pinterest is rolling out_a traditional messaging service to its site and mobile apps, giving users an easier way to send, save and_discuss Pins with one another. A massive number of technology companies have tinkered with messaging in the last 12 months_(see Path, Vine and Instagram) and while those have occasionally felt quite superfluous, Pinterest is hoping its own implementation will be more complimentary and relevant to its core offering. Plenty of people use Pinterest as a digital scrapbook for personal projects or upcoming events. If you’re renovating your kitchen, planning a birthday party or daydreaming about your perfect round-the-world trip,...