If I want to buy/sell parts on FB Marketplace, how important is feedback, profile, and friends?

I usually mention my user name here and mention that I’m a member. Lots of members from here are also my friends on FB too, and they usually chime in with a “trusted seller” comment, which I always appreciate. MeMike, 66340Sedan, Roberto DiCarlo, Clif Winslow, a lot of guys will vouch for you there as you build your profile. Some will also poke you around in fun, and if I see you there, I’ll give you a shoutout as well.
Sounds like you've got this down, and have a nice system (?) in-place! (Or is it a network? I don't know!!!)

I haven't logged-in a couple weeks or so, and I guess I really should try to expand my reach and "network" more now, before I retire. But that takes time, and that's a commodity I seem to have less and less of lately.

Thanks for the advice and/or idea!

Jim

Aka: "Claire Belle", named for Dog #1/Claire (in back), and Dog #2/Belle (in front).

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