External Followed Links History, number of links go down

[ctam]

I was reviewing Historical Domain Analysis and found that in last 2 month we lost almost 10000 external followed links. What this could be? is this real or just question seomoz crawling?

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[ak1lz]

This could be a result where your back links were coming from websites that have been de indexed or banned. Those websites were affected by the updates of Panda most likely. I am not a expert on the subject because I have not had to deal with it directly.. But the dates your links started going down looks about right.

Refer to this page for more info about Google updates: http://www.seomoz.org/google-algorithm-change

[Maximise]

If you are referring to the latest OpenSiteExplorer index then have a look here:

http://www.seomoz.org/blog/july-mozscape-update

Annoyingly the latest index is about half the size of the one before it so this could explain the loss in links. They say if you had a large amount of lower quality links you could see a big difference in total links as many of these are not indexed anymore.

[ctam]

Thanks a lot for this. Explain a lot, but still big amount of deindexed sites as for me. Any way thanks.

[ctam]

This explains even more, thanks.

[Boodreaux]

It is a function of the volume.  I lost about 20% of my links that were industry specific.