Lost all rankings in one week

[RobSchofield]

This post is deleted!

[Brafton1]

Might be a manual penalty.  They've got a decent number of spammy inbound links from blog comments going to their website.  I'd have them take a look at Webmaster Tools, but that would be my guess.

Jim

[JaneCopland]

Hi Robert,

Just checking back in to see if you had had a look in Webmaster Tools for any indication of a penalty. This is the sort of drop we associate with penalties, be they manual or algorithmic.

If they were using a link building service called My Blog Guest (or if they had used MBG at any point in the past), they could have been hit along with almost all other MBG customers. Google has gone on a rampage in the past few weeks, penalising a very large number of sites associated with that service: http://searchenginewatch.com/article/2335246/Google-Penalizes-MyBlogGuest-a-Guest-Blog-Network

The blog comment links could be a culprit as well.