IMO its better to have a few twitter followers who are interested in what you tweet rather than thousands of people / bot accounts who ignore your tweets
Please read first posts before you jump into discussion or even latest posts because this doubts about bots were already explained.
TWIENDS.COM is the best and most ethical because in other websites people after a while, massively stop to follow (what is, of course, a total failure when you do bounty or try to build an account). In fact,
all other services are fake and use bots, after some time when they get what they want, the script starts and
massively stop to following your account, all previously performed treatments are for nothing then. For a year I use
TWIENDS.COM only sporadically and I still have almost 4,000 followers...
Additionally, I made a Twitter Audit lately and here is my account report on screen:
As you see I have almost a higher score.
I have tested this service for almost 2 years and after such a long time I decided to write this guide because I have tested everything there and I can vouch that if you follow my guide you will have no problems at all and will gain a lot of followers if you need to. I wasn't able to get more as 250 followers in my original Twitter account for 7 years and I tried a lot of things. With Twiends.com I was able to get 4000 of them in 6 months. I don't think you will find anything better out there.