Hiring two people who are best friends would be no issue in a big company. I think that in a small business it could have the potential of creating a "power group" if they decide to gang up on management on a few issues. For example: Best friends might share their remuneration packages with each other and cause hassles if they think that the one is being favoured above another.
As long as ground rules (as recommended by HR Solutions) are in place before any hiring is done, and any warning signs are dealt with immediately - things should be ok.
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