Edge Rank. This is the algorithm that decides how Facebook places a story in each user's news-feed

Edge Rank: This is the algorithm that decides how Facebook places a story in each user's news-feed. Some said edge-rank died in 2011, it has resurrected in 2013 with more than 100,000 factors into account. Factors like Time of the post, as post gets older it loses points; Edge weight- comments from users, shares and other user activities increases your weight; The affinity score: how often do I communicate with the person who took the action, what time was the action taking and the weight of the actionless