Where in the past 3 - 4 sets have SOL and SoF explicitly worked together or teamed up? We simply haven't knowing if we team up we could probally take any combination of tags and there is no fun. The reason we keep our pacts in place are our own though a few points have been adressed in this thread.
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Next is the fact SOL as SoF have been less agressive then we normally are we're not randomly FSing alliances.
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I think SOL and SoF have both been helping out other allies then each other and keeping each other in check in terms of what we do.
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Facebook app --> New recruiting pool --> Alliances grow --> alliances divide and emerge + old powerhouse regain membership thus power --> Server dynamic changes.