While it's difficult to recruit groups of actual friends, we conduct tests all the time for products that require interaction between multiple people. Examples include messaging apps, multiplayer games, video chat, etc. In these situations, we can design the test to simulate the real-world experience as close as possible for testers. For example, we could have testers interacting with each other (we assign partners, share contact information, etc), or your team can play one side of the interaction. The way we design this exactly will depend on your specific goals and needs. Please contact us for more details.
This typically requires our Managed product, since it usually requires multiple sessions (e.g. coordinating amongst participants).