Abstract: A humic acid type fruit bagging-free film agent and an application thereof are provided. The humic acid type fruit bagging-free film agent is prepared by: dissolving sodium alginate into water, adding TWEEN-20 and SPAN-20 after stirring evenly, and stirring for mixing to form sodium alginate solution; dissolving humic acid potassium into water, adding glycerin then mixing to form humic acid potassium solution; stirring the sodium alginate solution and the humic acid potassium solution evenly to form agent A; and dissolving calcium chloride into water to obtain agent B. When in use, the agent A is sprayed onto a fruit surface, and then agent B is sprayed. It can not only be antibacterial, anti- freezing and pest-resistant, but also shorten film-forming duration and have better film-forming property. Shading performance is improved, and problems of rough fruit surface, serious rust and dim color caused by using paper bagging can be solved.

Abstract: A method of social interaction has the steps of providing a network having a set of mobile devices associated with individuals; identifying a plurality of units of at least one subset of the set of mobile devices, at least one unit of the plurality of units comprising a group of mobile devices formed based on common social connections between individuals; characterizing the units by one or more characteristics; ranking a compatibility of units by comparing the one or more characteristics; causing at least one invitation or message to be transmitted over the network from a sending unit to a receiving unit; and sharing contact information of the units once an invitation has been accepted.