Twitter is very useful .. You can get free visits since People are searching inside Twitter .. Users also will follow you and keep updated with you content ..
Twitter acts one of the most important tool for the internet marketers because it helps to build up network with people around the globe and tweeting on twitter will help to grow more business with more networks
maybe it can elevate your visit by you twit your link, so probably some one will click it... just hope
Twitter is a powerful platform to contact with your followers, connect new people and drive traffic to your site. If you want direct sales and immediate money, twitter is not what you want. If you mean to prequalify and build a list - twitter will bevery suitable.