Troubled Twitter works to lure more people, offer user tips, as it continues CEO search

Twitter's most urgent task is naming a new CEO. But the most formidable one is convincing enough people that its service is essential, easy to use and not just meant for celebrities, 16-year-olds and news junkies.

To help with the latter, there are big promotions, such as last year's World Cup push and this year's expanded content and advertising deal with the NFL to help broaden its audience. There are also smaller tweaks designed to help people find new features or take advantage of tools they might not have been aware of.

Recently, some Twitter users got a message saying "Retweet to share what interests you with your followers."

While elementary advice for some, the note shows Twitter is still trying to teach people how to use its service.