Yesterday, 5 of my sites, which had not very competitive, but solid ranks, got hit. My ranks for all sites dropped, main keywords dropped across all sites.
Things which were common between these sites was, they were hosted on same ip, had same adsense account. At least one of site was not hosted on same ip or had adsense account.
One of my main site which is hosted on same ip, does not link back to any of other 4 5 sites, but all other 4 5 sites are linking to my main site. These sites do not compete each other, but they are some what relevant. Not all sites link to other sites, however, all sites link to my main site. Sites, with no adsense account, and hosted on different ips do not seem to be affected.
Now, i am gradually removing all the links from sites hosted on same ip and same adsense, writing blog posts on different blogs for fresh links. Purchased new hosting account with a dedicated ip on some other hosting account and moving my main site to it.
I amWondering if its a penalty or simple devaluation of my back links, some of sites are several years old and they had their ranks untouched, untill yesterday. I only started doing inter linking 6 months ago.
Please let me know what else i can do here to get back my ranks.