FORTUNE – Some users and matchmakers treat LinkedIn as a source for romantic prospects, even though the company explicitly prohibits members from using it to pursue them. A June Zety survey of ~1K U.S. employees found that one in four believe it’s “fair game” for romantic advances. The survey also found that 22% had reached out or responded to someone on LinkedIn with romantic intent, while 12% had formed a romantic relationship that originated on LinkedIn. “With ~100M verified members, it’s not a surprise that people come to us,” the LinkedIn spokesperson said. “But LinkedIn is a platform for professional growth and career advancement, not finding a date.” Online daters also use LinkedIn as a vetting tool. Professional matchmakers recommend researching potential partners online, including scanning their LinkedIn profiles.