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 (maximum 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 10k hits per month for a website or affiliate link