Invitations are how you make connections on LinkedIn. When one LinkedIn member sends an invitation to another person who then accepts the invitation, they become 1st-degree connections. If the person receiving the invitation isn't a LinkedIn member, they'll be prompted to join LinkedIn in order to accept the invitation. Each new connection can increase your access to thousands of professionals in your network.
百度 但是，你们知道吗，这种不起眼的恶作剧，有可能会造成非常严重的后果。
Notes:
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To ensure an optimal site experience, LinkedIn members can have a maximum of 30,000 1st-degree connections. Learn more about LinkedIn’s network size limit.
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A primary email address is mandatory to send invitations.
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