The Weekly Strike is a Fireteam-specific mission, and is not a matchmade activity.
http://www.bungie.net/en/Help/Article/12239
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Edited by DDkin9: 10/25/2014 4:50:19 PMGot it. Then Bungie, can you please make an in-game Guardians hall where we can make these friends, and join fire teams? I only have one other friend with an Xb1. I'm an old timer (46yrs.) so not many gamer friends.