I've kept PCFs and I can say I've seen both scenarios, frogs that prefer company and frogs that prefer to be solitary, both in captivity and in the wild... here are a few examples

Name: DSC00071.JPG Views: 69 Size: 145.5 KBPCFs number 7, 6 and 5 communing on the apartment drain pipe. These three amigos hung out all the time together, catching bugs drawn by the apartment light.
Name: DSC00279.JPG Views: 69 Size: 138.1 KBPCFs number 5 and number 7
Name: DSC00323--2.jpg Views: 43 Size: 153.9 KBPCFs number 7 and number 5 (sleeping)
Name: DSC00474.JPG Views: 81 Size: 153.5 KBPCFs number 4 and number 2 (house guests this summer in my trailing African violet tank)
Name: Snapshot 36 (8-9-2014 12-31 AM).png Views: 49 Size: 294.2 KBPCFs number 1 and number 4
Name: Two Fat Frogs Napping.png Views: 80 Size: 277.9 KB PCFs number 2 and number 4
Name: DSC00043.JPG Views: 76 Size: 150.7 KBPCFs number 4 and number 1