My search tools are my eyes and my mind. In conjunction, they are effective at keeping me from reading the same post twice. When one or the other fails, I take a shot of single-malt and proceed with life.
Thus duplicate [or worse repeatitive,] posts of the same article don't throw my life off kilter.
I reccommend that those with a duplicate post phobia try my method. Oban seems to work best.
Did you search before posting? The search tool is your friend (when used correctly).
How would you know what to search for if its breaking.