Build a bot poster on a certain website!

I need a bot progam that is able to post on a certain website (is simple actually). The bot will use one of the logged accounts and post a certain post one time per second or 0.50s. However, this bot need to post simultaneously on 350 pages with 350 different specific texts for each individual page, every second or 2 seconds (Each page require a specific post for that respective page, 350 or 500 times).