Because the social network is large and includes dozens of people who already know you offline, if you lie about your age, occupation, or other such information, these people will know.
In addition, as I mentioned earlier, online communication with individuals that we know offline is marked by less lying than in-person communication, and the Facebook social network to a large extent involves presenting information to those in our social network.
Research on online dating sites has shown that men tend to lie more than women, with the exception being that women are more likely than men to lie about their weight (Hall et al., 2010).While the presentation of one’s personality on Facebook is likely to be relatively accurate, people do have a tendency to try to appear than they really are, by highlighting positive events and emotions over negative ones (Qiu et al., 2012).It’s difficult to lie about factual information on Facebook, unless someone is fabricating a completely false identity with a fake profile.This means that if you meet people via Facebook, you’re likely to be getting a relatively accurate impression of their overall personality. Some people are more prone to deceptive behavior online than others, such as those high in sensation-seeking, and those who show addictive behavior toward the Internet (Lu, 2008).
Sensation-seekers are also more likely to be dishonest offline.One survey of over 5,000 users of online dating sites asked them to rate, on a 10-point scale, how likely they were to misrepresent themselves in areas such as appearance and job information (Hall et al., 2010).