Most cases of what are solved by tips? Abducted women? Let's keep in mind that not all cases are the same -- not even all cases of missing or abducted women -- so I think it would be stretching things to suggest that most cases are solved by any one type of information.
But not to diminish the value of tips -- but I wonder what people might think is keeping 'the public' from sharing the information they have? The lack of a suitable Facebook page? I mean, let's say someone knows something -- they know that Holly was abducted, they know this is a bad thing -- what really does anyone think would be holding them back from calling it in?
I'm sorry, I guess I think better of the public -- the same people participating in ground searches.
RE: but I wonder what people might think is keeping 'the public' from sharing the information they have?
Many times witnesses do not realize that the info that they have is important to the investigation. Especially in stranger abductions.