Can someone be a member of Phi Beta Kappa and other academic honorary societies at the same time?
Yes. Many Phi Beta Kappans are active members of other organizations such as Phi Kappa Phi or Mortar Board or discipline-specific societies such as Sigma Tau Delta. The various legitimate honor societies are all a little different in what they emphasize and recognize and do. However, there are scams in honor societies as in everything else. Something is not necessarily a legitimate honorary because it maintains a good-looking website, offers a shiny lapel pin, charges a large fee for membership, or claims to be an honor society.