Mr. Cornell and his firm maintain Jotly as a side project alongside their main product, Nosh, a "meal discovery" app that lets people rate individual restaurant dishes.
Just as iTunes lets you download individual songs rather than entire CDs, streaming services, cable and satellite companies now allow customers to rent movies as well as buy them.
The company is quietly solving that problem: an update pushing out to individual users lets them drag-and-drop photos into a new post, like we've seen on other social networks, and to a newly streamlined Messages format that's rolling out at the same time.