I don't expect to find bikes on craigslist or FB for "$25-$50." I wouldn't bother with the hassle of selling online for $25 or $50. I would guess that many others feel the same way. If you can't get some reasonable monetary return on the time you spend photographing, listing, and responding to inquiries, why bother? Easier just to give it away. This is part of why the $50 bikes are found at thrift stores, bike co-ops, and yard sales.
Brent
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"I have a tendency to meander sometimes." B.G.