I have 59 twitter accounts and one main twitter for my website that is connected to my rss feed
My plan is is to retweet my main account from all these 59users , 3time’s a day. not more.
do you think its safe ?
To be honest, there could be issues if all you’re going to do is retweet from only one source.
My advice would be to mix actions, add follows, unfollows, own tweets for those accounts (simple text , without links), some favorites. Make them look natural.
Accounts that retweet from only one source 3X per day and doing nothing else are screaming “SPAM!” 
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