Google have finally introducing a tool that enables webmasters to upload a text file containing any links they would like Google to ignore.
"We recommend that you disavow backlinks only if you believe you have a considerable number of spammy, artificial, or low-quality links pointing to your site, and if you are confident that the links are causing issues for you"

http://googlewebmastercentral.blogspot.co.uk/2012/10/a-new-tool-to-disavow-links.html
However it's important to state that if you haven’t received any link advisory warnings based on “unnatural links” pointing to your site, this tool isn’t something you need to use.
The disavow links tool will become vital for actioning the removal of links from websites that do not respond to link removal requests. Although it can take a little while for Google to recognise any disavowed links (John Mu mentioned this in a recent hangout), it does look like this tool is quite powerful.
Webmasters have to be careful not to use it ‘wholesale’ on their backlink profiles if they have been penalised otherwise they may risk losing many good quality natural links in the process. We recommend conducting a thorough link audit before you consider using the disavow tool.
In a recent post on a webmaster help forum Google engineer John Mu highlighted the importance of a good head shot for authorship thumbnails to display correctly. He referenced this help center article and highlighted the importance of "a good, recognizable head shot as your profile photo -- it's really more than just having your face somewhere on the photo.”
We also advise clients to use a good quality head and shoulder shot for their Google+ profile as we have seen instances where despite the correct authorship markup being in place, if the photo isn’t appropriate, then the thumbnails have not been generated in Google’s results.
A recent tweet from Matt Cutts also highlighted just how many updates Google are making right now to it’s algorithm. Combined their alleged transparent approach it’s understandable how this seems overwhelming to many webmasters

Google have historically made 350+ updates every year so whilst the increase it noticeable it’s important to remember that Google is in almost permanent beta. Some changes are more obvious than others in terms of their impact however we expect the waters to be choppy over the rest of 2012 and into 2013.
A common myth that is discussed in the SEO community is that of high spending adwords clients getting preferential treatment in organic results or more robust in terms of algorithmic or manual penalties. This appears to be something that the search quality team at Google have been considering as Matt Cutts published the video below on 29th October discussing the point.
“..we want to be as fair as possible and that's why even if you buy adwords ... the fact is we would like you to go to the exact same support channels as anybody else on the web would have so that there's no appearance of impropriety or anything along those lines"
Matt Cutts
Matt Cutts announced on Twitter that Google has officially updated the page layout algorithm that it launched in January of this year. This is the first official and confirmed update of this particular algorithm.

Often referred to as Google's 'top heavy' update, this global rollout shouldn't have a huge impact on legitimate publishers as it was always aimed at websites that were aggressively monetizing their websites above the fold. Matt didn't elaborate on whether there were any significant changes so we should treat this as an "algorithmic improvement that tends to impact sites where there is only a small amount of visible content above-the-fold or relevant content is persistently pushed down by large blocks of ads".
Google also released some data regarding increased activity on tablets and smartphones during holidays indicating that we are likely to see a record amount of clicks this Christmas from mobile devices.
“...not only are people searching more on their mobile devices during holidays, but they’re actively looking to connect with businesses...We see these same mobile trends during holidays throughout the year, but find that they’re particularly pronounced on big shopping days like Thanksgiving, Black Friday and Cyber Monday”
The charts below show a significant spike in visits from mobile and tablet devices during US holidays Labor day and Thanksgiving and we can expect to see these results echoed in the UK marketplace during Christmas.


Google also translated this into some practical advice for publishers
Read more via the link below:
http://googlemobileads.blogspot.co.uk/2012/11/new-data-shows-surge-in-holiday-mobile.html