Instagram last week announced a new Explore video channel that gives users an easier way to find and watch events. The channel aggregates videos from concerts, sporting events and more, and its personalization features flag events that might be a good match for users' individual interests. The new channel initially will be available only to U.S. users. "One of the fundamental limitations of Instagram is that you only see content from people you explicitly follow," said Jan Dawson, chief analyst at Jackdaw Research.