Simple but heavy application consuming a lot of resources. How to Optimize?

Question

Currently I have one monitor application in production. The job of this monitor is to collect specific entries on social networking like facebook, twitter, youtube and so on

Answer 1

Disclaimer: this is one of my comments on this question which might be the answer:

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I think match ... against is appropriate here. It is so-called "fulltext search". For more complex searches, I'd use Sphinx - it indexes your database on its own (has own mechanism for it) and perform searches way faster than MySQL does