Without relying on Facebook, Lady Gaga is able to host a specific interest, purpose-driven global community where fans and other stakeholders could exchange ideas, co-create adventures and otherwise bond in ways that boost participation in all her profit centers.

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Harrison notes that caterpillars feast on very specific host plants that often differ from what butterflies prefer.

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That means Internet service providers--many of whom had developed efficient systems for disconnecting specific host computers from the Web--can't keep up with scammers, Mather says.

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One should not, for example, compliment a host on any specific item in his home, as he will then feel obliged to offer it as a gift.

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The best rule of thumb for corporate types: Don't host an event for a specific lawmaker, but events open to certain delegations are fair game.

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But in a fortunate 20%, this arms race is stacked in the host's favor, with antibodies that are able to neutralize not just the latest, specific mutated version of HIV but a broader range of viral marauders.

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