How to modify the image that appears on facebook when I put the link to my site?

Question

Whenever I post the link of my site on facebook displays a default image that I used to use for this purpose. However I changed the image in the TAG below more than 6 days ago, but the old one still appears. Remembering that the new image has a new name and the old one has been deleted from the server, but still do not know where capturing the old one.

Already test on multiple computers and mobile devices.

<meta property="og:image" content="http://www.roteirodoimovel.com.br/roteiroimagemnovo.jpg" />
<meta property="og:image:type" content="image/jpeg">
<meta property="og:image:width" content="720">
<meta property="og:image:height" content="479">

I really need help.

Answer 1

Depending on the amount of hits, Facebook can cache the files for a long time.

To force the update of the information, you must access https://developers.facebook.com/tools/debug and ask him to update by typing the URL you want, then click Debug and then, Fetch new Crape information (do not know if there is version in en, if there is, please edit).

Doing this for your URL (http://www.roteirodoimovel.com.br/) gives a Warning:

og:image could not be downloaded or is Too small

og:image was not defined, could not be downloaded or was not big enough. Please define a Chosen image using the og:image metatag, and use an image that’s at least 200x200px and is accessible from Facebook. Image 'http://www.roteirodoimovel.com.br/roteiroimagem.jpg' will be used Instead. Consult http://developers.facebook.com/docs/sharing/webmasters/crawler for more Troubleshooting tips.