LinkedIn is the undisputed king of professional social networks.

Krista Canfield, a spokeswoman for the website, said LinkedIn has surpassed 100 million users and job postings have swelled to more than 62,000 listings, according to Forbes. LinkedIn is a hub of activity for working professionals and individuals embedded in their employment search.

Financial services firm Morgan Stanley recently said that Linked In could become a "standard utility" for recruiters and a website that "transforms an industry," according to The New York Times.

Forbes recently published a list of tips for LinkedIn users who are looking to bolster their professional profile. For starters, individuals should include more than just their current job on their pages because many recruiters are looking for candidates with years of professional experience.

In addition, users should consider adding a photo to their profiles. Canfield told the media outlet that profiles with images are seven times more likely to be viewed than those without photos.

Robert Hellmann, a career coach and author of the book entitled Your Social Media Job Search, recommends connecting with at least 70 people. It is important not to connect with complete strangers but instead reach out to past colleagues, friends, family and other professionals with whom you have a good rapport, Hellman added.