For me follow-unfollow method didn't worked at twitter. Nearly 0 traffic got back + all the times PV/email confirm. So I DO NOT follow users anymore ( only if follow my own accounts to don't have 0 followers ).
Now I'm doing more LIKES and TWEETS ( also retweet own tweets from other acc ), as from there goes all traffic.
Doing tweets from 5 per day + increase by 5 every on fresh acc. Older accs do 300-500 tweets (likes about 1.5 times more).
Anyway I'm getting PV/email confirm time after time. It's normal. Usually have PV, when acc don't have mobile phone attached. And later you can choose confirm by email or phone. Usually have 4-5 confirms on acc and then it lives forever ( I hope )