1. Link out to bad neighborhoods: Google follows links that are on your site and linking out to unrelated sites, spam sites, or link farms will put your site in a bad neighborhood. This will drop your quality and trust score and ultimately your rankings within Google.
2. Implement a massive link campaign: Gaining inbound links to your site from reputable, relevant high page rank sites is one of the building blocks for good rankings. This can actually hurt you if you do it too quickly. Building links should be a gradual process (or at least appear as one).

A few years back design firms would put their link on the bottom of every page of sites they would design. This massive influx of links from those sites threw up a red flag with Google as if they were participating in link farms that spammed the search engines with links. This actually had the opposite effect that they were hoping, and Google started ignoring those links because they looked like spam.

I guess it’s a double edged sword, you would not want Google counting a bunch of spam links that your competition put out there pointing to your site and subsequently hurting your quality and trust score. So in that regard it helps, but it also blocks a site from gaining hundreds or thousands of links overnight even if the intentions are good.

3. Adding thousands of pages to a site overnight: There are sites that create many pages quickly or have many articles they add to their site at one time. The best thing to do would be to release these in waves and not all at once. Again, this throws up a red flag in Google and the fate of those pages is either, they are instantly dumped into the supplemental results and the only way to get them out is to build quality links to those pages or even worse they will not be indexed at all.

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