Localbookmark is an online  Business Directory catering to people of USA currently has over 500,000 companies listed and is growing everyday.

Your colleagues could have added your business to Localbookmark .Also many of Localbookmark’s listings have been sourced from crawling publicly available information on the internet.
 

Businesses appear at the top of the list due to their ranking first, and alphabetical order second. Ranking is determined by the amount of relevant information contained in your listing. The more information relevant to the search term, the higher your ranking. Relevant information can be contained in:

• business description, including brand information
• web address (URL)
• articles (particularly the headlines) that you add to your listing

The more relevant information you have on your company listing pertaining to a particular search phrase, the more likely you are to appear on the first page of results for that search phrase.