How are you following 2.5k per day when Twitter only allows you to follow 1k?
The limit increases as your account starts gaining more authority. For example, if Justin Bieber would like to follow 5k people in one day, he could even do that and Twitter won't still suspend still account since he is now verified and has got his limits increased to a great extent.
I've had my personal account for 2 years. I can follow around 2,500+ people a day without a ban hammer.
I'm not sure how that's happening then, I have a five year old account with 150k followers & 5k tweets which is still only allowed to follow 1,000 per day, and there is nothing anywhere in Twitter's help files to suggest that limit is increased for some users.
The only exception I know is that the android platform is at present allowing you to follow more than 1k per day, but I'm sure they'll put a stop to that soon enough.
haha so you click 2.5k Follow buttons a day ?3 year old Twitter account here, I can confirm this.