My friend buys and flips used exercise equipment on FB Marketplace. Craiglist can be a bit shady as you don't really have name or face to the seller/buyer. On one hand, the anonymity on Craigslist is nice for either party but on the other, it can lead to a dangerous situation. With FB Marketplace, you can quickly glance at their profile and have atleast a name and face to the individual buyer/seller.