It would be easier to handle all the calls if he could at least trade tips with his coworkers.

如果他能和同事们交流经验，要处理这些电话会容易一些。

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Ms. Heller, 36, is CEO of the invitation-only social network, which began nine years ago as a site where fancy people could trade tips on art openings in London or samba nights in Reykjavik. ("Facebook for the few, " as Ms. Heller put it with a sigh.) An invitation to A Small World was once highly coveted, but the site's social currency has waned in the Twitter age.

WSJ: Q&A With A Small World CEO Sabine Heller | On the Road

But now knowledgeable amateurs and industry experts can trade stock tips for no charge in popular personal investing sites such as the Motley Fool.

ECONOMIST: Electronic commerce

Mr. Robinson blamed Mr. Kluger for pressuring him to trade on inside tips.

WSJ: The Confessions of an Inside Trader