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Sometime bloggers use their blogroll to exchange links to other blogger. It's a good way to get extra traffic and build page rank. But take note that blogroll can either help you or hurt you. Matt Cutts explains why?
Conclusion
This is the time when we have to think and make a good decision before putting someone else links. It's your page rank that is in risk here. Try weighing what to "Do Follow" and "No Follow".