has revealed the social media apps which are used most often. Top of the list is Facebook
, with 53 percent of the 1,757 U.S. respondents saying that they access the mobile app several times a day - pretty far ahead of its competitors. In second place is Facebook-owned messaging service WhatsApp with 44 percent. The rivalry between Snapchat and Instagram is too close to call in this regard, with Snap's app claiming a slight edge.