Twitter's problem isn't advertising, it's that the site/service is and has always been hard to use and doesn't make sense to the average person. The most common

Twitter's problem isn't advertising, it's that the site/service is and has always been hard to use and doesn't make sense to the average person. The most common way the vast majority of people "access" Twitter is probably when they see tweets shown on TV news, which means no advertising revenue for Twitter. The learning curve for Twitter is extremely steep, and there's a lot of jargon you have to learn. You can see the difference by looking at Facebook. They are also instituting lots of supposedly "user-unfriendly" policies, and yet their stock price keeps going up, as do their user numbers and revenue.