Twitter's infamous "Fail Whale" -- a sign that the site is down -- has resurfaced in recent days, leading Chris Crum to ask a number of social-marketing thought leaders how much longer the site's users will put up with its patchy service. The consensus is that the site has locked in its users for now, but that outages are making Google Buzz and Facebook look increasingly attractive. "Twitter might want to get this under control before it's too late, because there are alternatives out there, and this Fail Whale tolerance might not last forever," Crum writes.

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