Participants in the like condition indicated that they liked their people more, had more knowledge about them, and spent more time with these people than participants did in the dislike condition. 

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Participants were randomly assigned to a liked or disliked condition; they were instructed to make a similarity map for either 4 people they liked or disliked. Participants also indicated how much they liked, knew, and the amount of time typically spent with each person. 
This was done to see if liked targets only appeared more similar in experiment 1 solely because they were also in the presence of disliked individuals.

Experiment 2; All My Friends Are Alike

Alves, H., Koch, A., & Unkelbach, C. (2016). My friends are all alike—the relation between liking and perceived similarity in person perception. Journal of Experimental Social Psychology, 62, 103-117.

My Friends Are All Alike

Exp. 2 Results: Liking, Knowledge, and Time Spent Together (Alves et al., 2016)

Similarity was assessed using a distance measure; the distances between target persons in the liked condition were significantly  smaller than those in the disliked condition. Basically, liked others were perceived as being more similar to each other regarding their personalities than disliked others were. 

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