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I have been using Tweet Old Post to random display reposts from articles but it may be more trouble than it’s worth. I don’t have my blog setup in a way to allow only articles useful several months later to retweet and there is no point to repost a breaking news type of article 3 months later.
I wish Tweet Old Post could let you set date ranges for each category instead of only for all tweets in your reposted categories. As my traffic from twitter isn’t very high anyway in comparison to my blog as a whole, I am considering removing Tweet Old Post from my blogs entirely and just using Dlvr.it to send my feed out no more than 3x per day (every 8 hours) to make sure everyone in all time zones can see it. Then not reposting any old articles automatically except using Twaitter to repost contests for duration of contest or a few of my profitable review articles which sometimes lead to an affiliate sale.
I am going to make the final decision by the end of the week to either remove Tweet Old Post altogether, for now I trimmed it back to tweeting no articles older than 30 days and no more than 1x every 12 hours.