Oh the weirdness of Twitter. You need external services to find if people have unfollowed you, use services to find when someone favorites your tweets, send multiple DMs and what not. Likewise, Twitter also misses another basic functionality, that is to know whether or not someone you are following is following you back.
Agreed that there is the follower and following list, but if you have 1000s of followers, it is really hard to sift through the entire list to just figure this out for one person.
However, like always there are several Twitter apps and services built around Twitter, to solve problem Twitter provides users with. So if you are looking to find out if someone is following you on twitter and don’t want to sift through a huge list, head over to DoesFollow.com and enter the twitter handles and your question, whether someone follows you or not will be answered in a few seconds.
To make use of DoesFollow, just enter the Twitter handles and click on the Check button, that’s it, you will be answered with either a yup or a nope. So the next time you want to figure out if someone is following you or not quickly, head over to DoesFollow.com.