Is this a dead pixel?

I saw this white dot on a ask.fm page. I am not sure if it is a dead pixel because this pic is an screenshot and i dont think dead pixels show up on screen shots.
also the dead pixel dissapeared when i left the web page. I think it is just a bug of the webpage but i want to be sure. Remember that this pic is an screenshot.

Hablas Español?
Para explicarlo mejor prefiero hablar español jaja.
El pixel aparece en la pagina ask.fm pero yo pienso que los pixeles muertos solamente aparecen si tomas una foto con una cámara de celular no una captura a la pantalla con command - shift - 3.
Además cuando uso la app vista previa para ver el png de la toma de la pantalla puedo recortar la zona donde está el pixel moverlo a dónde yo quiera, incluso esa foto que está arriba no es la original yo recorté la zona dondeaparecía el "pixel" y creé otro png.
Incluso, el png está como un icono en mi escritorio y si observas el icono detalladamente puedes ver el supuesto pixel muerto. es como si fuera parte de la imagen y no un pixel muerto en si. yo pienso que los pixeles muertos se quedan en un solo lugar y no se mueven y aparecen en los iconos de las imagenes etc.
incluso pienso que un pixel muerto no aparece en una captura de pantalla

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