Lots of people use Twitter who aren't celebs. Kelly G had a lot of lift pics that she tweeted. I'd think that the most common thing might be when someone tweets a single pic of themselves because it's something they think is unusal. Calling that a needle in a haystack is an understatement but I'm sure there are pics to be found there.
Twitter does not host pics or video but there are services like twitpic and yfrog that host. Those sites aren't very searchable because most of the content is uploaded from mobile devices and doesn't have descriptive labels attached to it. Any description would be in the tweet that also contains a link but there's no guarantee there that the words would be descriptive either.
I'm sure it's a source, possibly a goldmine but I've been beating my head against this problem on and off for a few years now. Maybe someone knows some trick that I can't think of.
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