I love Spark teams, but I limit the number I join due to computer usage time. I can say that one thing that takes them "away" from a community feeling is when it gets too large. A smaller spark team is most definitely more intimate, so you can actually get to know people.
It's a tough one, because people often come and go, and I don't know if you can limit the number of members, but I can only speak to my experience.
Best to you and kudos for trying to make another positive thing happen on SparkPeople!!!
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