Matt Cutts, Google’s head of search spam, answers a question about meta descriptions in his latest video where a user writes in to ask:
Here is the video for you all to watch:
Should webmasters use the disavow tool, even if it is believed that no penalty has been applied? For example, if we believe 'Negative SEO' has been attempted, or spammy sites we have contacted have not removed links.
James, Bristol, UK
Today's webmaster video: Should I use the disavow tool even if there's not a manual action on my site? http://t.co/w91HzJPIG9
— WMX (@googlewmc) November 20, 2013
The main purpose of the tool is for when you've done some “bad SEO” yourself, or someone has on your behalf.
At the same time, if you’re at all worried about someone trying to do negative SEO or it looks like there’s some weird bot that’s building up a bunch of links to your site, and you have no idea where it came from, that’s a perfect time to use Disavow as well.
I wouldn’t worrying about going ahead and disavowing links even if you don’t have a message in your webmaster console. So if you have done the work to keep an active look on your backlinks, and you see something strange going on, you don’t have to wait around. Feel free to just preemptively say, ‘This is a weird domain. I have nothing to do with it. I don’t know what this particular bot is doing in terms of making links.’ Just feel free to go ahead and do disavows, even on a domain level.
Checked with reference to the documents mentioned below…
I find this video from an official twitter account @googlewmc. it's very informative and i enjoyed very much.