LinkedIn's business value was highlighted when Microsoft asked a member of its IT recruitment staff to put together a team to reverse-engineer viruses.
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Microsoft saved an estimated £60,000 and was able to source candidates with specialistIT skills from across Europe.
Declan Fitzgerald, IT recruiter at Microsoft, said he had to find nine techies with skills in the rare Assembly and X86 software languages.
He said through normal methods such as advertising and recruitment firms he would have struggled to find people with these niche skills. But through LinkedIn searches he filled seven out of nine positions.
"These are quite unusual skills which are used to protect hardware," said Fitzgerald."We get attacked, soabout 18 months ago we decided to create a team that can continually reverse-engineer viruses."
"We knew we would have to look across Europe to find these people, and LinkedIn allowed us to contact people in Finland and Romania where the recruits came from."
He said the £60,000 saved was in direct recruitment company fees.
Simon Kelly, director for corporate solutions Europe at LinkedIn, said the social media site gets one million new members every 17 days. It has 10 million members in Europe.
He said Indian IT supplier HCL has been using LinkedIn to recruit and has saved £300,000 in recruitment fees in a year, andbrewer SAB Miller saved £1.2m in a year in recruitment fees by employing 120 people directly from LinkedIn.