Twitter recently launched a follow button which can be embedded in your website. Unlike the previous buttons, you don’t have to link back to Twitter to process the follow anymore, if you’re already logged in, it will add the website/person as a follower straight away!
It’s very similiar to the Facebook Like button on most people’s sites, although once you click follow you can’t unfollow without going back to Twitter. No big deal…just choose wisely : )
As you can see below Mashable have it installed on their site.
Before the follow:
After the follow: