Assuming you are talking about Twitter...They state that their limit is 500/day. There is also a limit of 150 transactions/hour (include follows, unfollows, tweets, etc.) When you approach or exceed these, you can expect your account to get banned. I use software that auto-follows for me. I set it at 400/day and never have had any problems. You also need to spread it out over the whole day.
Assuming you are talking about Twitter...They state that their limit is 500/day. There is also a limit of 150 transactions/hour (include follows, unfollows, tweets, etc.) When you approach or exceed these, you can expect your account to get banned. I use software that auto-follows for me. I set it at 400/day and never have had any problems. You also need to spread it out over the whole day.
I follow 650-675 people a day with a 60-120 second pause in between follows. Once I reach the maximum follow limit I unfollow for about 4-5 days and repeat the process.
I've been doing this all year.