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I have been summering at a small firm and it will be over soon. What do you think about emailing the entire firm my contact points when my summer is over? I worked for every single one of them or at least had group lunch/dinner together, so it won't be weird.

I might not be coming back to the firm upon graduation, however, since the firm is not sure whether they hire me. Is it worth it, for, say, networking or other reasons? What are the negative consequences?

Not that weird if you include your email/phone in a general thank you email.