fix 1

fix 1: sharenxs.com
Test:
http://sharenxs.com/view/?id=keyegyb-08000096-6t58xqc
http://sharenxs.com/gallery/aq2cg0h-bzhghh2_52362c69405d3 (has `img[contains(@src,"/thumbnails/")]'`)
http://sharenxs.com/gallery/momsen-ctop_5248a80ba5793 (has `img[contains(@src,"/photos/")]'`)

fix 1+: found another rarer one and updated:
http://sharenxs.com/gallery/gv06ufi-1357292180_52361c9ba161c/vfdw3xk-2136210025342-48jo3po/original (has `img[contains(@src,"/images/")]'`)
none of pages with single image shown have `og:image`