I use my own phone number/email etc, never had an issue of abuse or retaliation.
Ebay - Gives you a massicve audience, anything I list seems to sell on Ebay.
Craigslist - Seems like the easiest place to use. Just a couple text messages and they are on their way to you or vicey versy...
Facebook - The BEST place to BUY a great deal, but a very FAST audience. Nice parts go quickly!! However, you will get a TON of tire kickers and other peoples worthless comments on how expensive your part is. I have very poor luck with ATC sales on FB. As a seller, you will not get top dollar on Facesnatch, but, you will get allot of unsolicited advice and complaints!!...
Ebay gets me top dollar, you just have to calculate in your time, their fees and everything else involved such as cleaning, packing, listing and shipping the item.
As an example, I get 600$ for an ATC speedo kit, 500$ for NOS 350X shrouds etc etc, I will not list anything that I cannot double my money on, that's the rule...
But sometimes, you get 500% or a 1000% markup on the small items like the 4$ grommet you bought in 2005, that is now 30$... Only place to get that kind of up sale, is EBAY.
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country