Most people are on Twitter because of network effects. Twitter made this a non-issue for lollicon users by banning them, but it's also interesting to note that

Most people are on Twitter because of network effects. Twitter made this a non-issue for lollicon users by banning them, but it's also interesting to note that it sprang up due to support from an existing website. Most people (myself included) who are dissatisfied with aspects of Twitter are not motivated enough to try to fix them.