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I will make you a custom automated twitter account
Posts automatically 24/7
Legal and within twitter rules
2 keywords
2 feeds to your twitter account
The bot runs from my server, it searches twitter for keyword, it re-tweets and mentions that post via a feed directed to your existing twitter account (max 120 tweets per day)
There are many variations of bot, that would depend on your requirements and how busy your chosen stream
Not recommended on a brand new twitter account
With one account tweeting once a day the bot can generate 15k hits per month for a website or affiliate link