You have either followed them by accident or someone else has access to your account. Change your password if you think this is the case.
No, but I am aware that some people follow others on Twitter.
Followed by is a term usually widely on Twitter in reference to the number of people following some tweep.
You can DM all people on Twitter. The problem with DM'ing some people is because they have not yet followed you. Until a person follows you back you will remain unable to DM them. Once they have followed you back you can do both public (@) and private (DM) conversations. Unless, of course, they stop following you for whatever reason. The moment they do that you no longer will be able to DM them. Good reason to maintain Twitter etiquette and playing nice on Twitter else you be unfollowed. Or worse, even blocked. If you receive to many blocks your Twitter account can actually be suspended. All part of the way the world works on Twitter.
You cannot follow Twitter user directly from Facebook. If you see that some one has integrated his twitter account with Facebook and his tweet is poping up in your news feed (Facebook), you will see a twitter symbol below his/her post. Click on it and you will redirected to Twitter page. If you are log in on Twitter you can follow the person.
The only way to delete someone who is following you is to block them.(Go to their profile and click "block")If you want to delete someone that you are following then go to their profile and click "unfollow".
Yes. There is an official Twitter app which is free. It is simply called "Twitter". There are also various other Twitter applications from third parties. Some of these are free and some you are required to pay for.
You can make trivias on twitter by searching some facts and then posting it on twitter :)
You can easily find twitter accounts of the stars by simply searching just one famous person.. for example @aplusk is the account of Ashton Kutcher and he is follow by many stars from Hollywood and other important people... just check who's he following and his followers and you will see them... most of the accounts have a blue check sign next to their names, this means that the account is real.
Following are some good social networking websites: 1. Facebook 2. Twitter 3. linkedIn 4. Pinterest 5. WordPress
This means that they have a "verified account" These are only given to famous people to help fans find the correct profile for the celebrity and not one of the fake ones.
there are a lot of Justin bieber fanclubs on twitter, just search on the twitter website for some : ]
Well some famous people do reply/twitter back. So some might, and some wont.