Even committed LinkedIn users can be uncertain of which connection requests to accept or extend. It’s possible to connect to almost anyone—but that doesn’t mean you should. Instead, think about the two-way quality of your relationships. Use a filter to help you connect to those people who will be able to help you, or whom you would be willing to help.
Try the “favor test”: Would you do a favor for this person, or ask a favor of them? If so, make the connection. If not, take a pass. If you’re consistent in applying the favor test and selective about which connections you initiate and accept, you can tap LinkedIn’s power as an introduction machine: an address book in which all the entries can see and connect with one another, and a network that’s efficient in supporting your professional goals.
Adapted from “Should I Accept that LinkedIn Invitation?” by Alexandra Samuel.