Find Websites for company contacts

Description of Business Development: I need to find websites of prior company contacts. I will supply 200 in an excel spreadsheet which has the Company Name and contact details I have. All you have to do is google the company to find their website address.If they have no website but there is a facebook, twitter, instagram or other social network page then put that page in the website column on the spreedsheet. I have found the best way of doing this is to google both their company name and town name or company name and postcode to find their website. I do not need their contact details verified. All I need is their website or their the page of their social network if they don't have a website. I did 650 of these yesterday so know it will take about 2 hours to do.
Extra notes: This has slightly changed from earlier an earlier job post which I posted earlier. I now do not need their contact details verified.