Have you ever trawled through your list of friends on Facebook and wondered “why the hell am I friends with this person?” If so, it seems that you’re not alone. In a recent survey by NM Incite, a Nielsen McKinsey company, it was found that a lack of knowledge about a person was one of the main reasons people place their Facebook friends on the chopping block. The survey, which polled over 1, 800 social media users, examined why people add or remove friends from their Facebook account. Other factors that influenced people to wave goodbye to their Facebook comrades were offensive comments (which topped the poll) and depressing comments. So a word to the wise: stay clear of negativity and self-pity when it comes to Facebook because you could very well see your friend numbers dwindle as a result. It seems the nature of  one’s content on Facebook can also be a determining factor, as over 14 percent of those surveyed said they unfriended someone over political comments while 6 percent claimed they removed friends because they updated their profile too often. The outlook was a bit more positive when it came to adding friends, as it looks like real world interactions continue to drive online friendships. The survey found that 82 percent of Facebookers “friend” people they know in real life, while 60 percent connect with mutual friends.  Others in the survey tended to be a bit more fickle though; 8 percent of respondents said they added friends because of how physically attractive they are, while 7 percent friended people merely to increase their number of Facebook acquaintances. 7 percent also answered that they will add someone on Facebook because of the “quality of photo.” Whatever that means. Now that you know the proper Facebook etiquette (don’t be depressing, don’t have political views and most important of all, do try to look attractive in your profile pic) there’snothing stopping you from bolstering your Facebook friends.