Twitter will likely never fall.
The growth and atmosphere are suitable to last the duration of the Internet.
The amount of publicity to tweets is more than Facebook and it's intuitive structure holds value for all purposes for marketers, fans / users, businesses, advertisers and content creators alike.
Twitter profiles can establish grounds quickly and direct traffic at an jnprescedented rate and it defined the social network atmosphere.
This thread popped up in comparison to Facebook when it became established years before and look at where it is now... At the top of the charts. Even with competitors, look at Google's rivals and things that pop up that end up dying like al those ponzi's making false claims, underused websites and creative material that gets hype and moves in the graveyard.
In no means will TWITTER die, FACEBOOK wouldn't fall and hasnt since these threads were last posted. In fact, they both spiraled and boomed.
Twitter is in Television and news more than Facebook on every channel and in every ad, but there are more business to consumer advertisements lenient towards Facebook and their FanPage feature.