It's because the site logo is added via a background image and the
only image it finds in that image next to the text "page is the
powered by MediaWiki". It would show the site logi if the logo was
changed to an image tag instead. Alternatively a meta tag such as
<meta property="og:image" content="..path/sitelogo.png" /> could be
added to the head of the document (possibly via some kind of hook) to
get the desired effect.

On Tue, Jun 5, 2012 at 12:47 AM, John Du Hart <[email protected]> wrote:
> Yeah I remember that.
> On Jun 4, 2012 7:45 PM, "Chad" <[email protected]> wrote:
>
>> On Mon, Jun 4, 2012 at 7:35 PM,  <[email protected]> wrote:
>> > Here Facebook grabs the Mediawiki logo instead of the site logo.
>> >
>> >
>> http://www.facebook.com/groups/tg.taiwan/permalink/374509135949001/?comment_id=374537129279535&offset=0&total_comments=1
>> >
>> > Doing the same experiment with e.g.,
>> > http://en.wikipedia.org/wiki/1st_clan_chief ,
>> > a page also without any user embedded images,
>> > oddly does not cause the mediawiki logo to be chosen.
>> >
>> > Though it does not choose the site logo, at least it doesn't choose the
>> > mediawiki logo.
>> >
>>
>> Didn't we discuss this almost a year ago?
>>
>> Indeed, we did:
>> http://lists.wikimedia.org/pipermail/mediawiki-l/2011-July/037710.html
>>
>> -Chad
>>
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-- 
Jon Robson
http://jonrobson.me.uk
@rakugojon

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