Google launched the Web History feature a few months back.
It caught me by surprise as for at least a few hours I was over the moon thinking my keywords were all on 1 position. The sceptic in me started to investigate and this joy was short-lived ?
Since then every time I see an unexpected rise in the SERPS I go and check the web history feature. The blighter keeps getting switched on itself and it has now become a pain in the back side having to switch it off every so often.
Looks like I will have to find some sort of plug-in which will keep it switched off for good.
At the moment competitors can damage your site in several ways, things that Google lets your competitors affect your rankings with are:
1. Inbound links from “bad”/”dodgy” places.
2. Hundreds of links from one IP address.
3. Duplicate content:
a) from competitors scraping your entire site and creating their own from it
b) from competitors stealing your articles and submitting them to article
c) from sending bogus query strings to your URLs
d) getting your site spidered under SSL
4. 301/302 redirect hijacking (after all this time, it STILL happens!)
and there is new 301 hijack which is causing sites to drop like flies.