Why does "Links to Your Site" in Google Webmaster Tools Have a Sharp Increase?

[CrazySales.com.au]

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[MoosaHemani]

Hacked? Penalized :O… relax, looks like you are over conscious about your data available on GWT which is good to an extent but increase in back link profile never always means you are hacked or penalized by Google.

In order to verify what exactly happened in your website, my advice is to go to Open site explorer and check the just discovered links and see who linked back to your website recently. If what you see scares you (in terms of quality) you have to worry about and take preventive measures accordingly!! (Like removing the links or disavowing them).

Incase what you see looks good to you, than no need to worry about the insane increase in links that point back to your website.

Actually, Links are the byproduct of a great effort on generating quality content, so if you have one, people will naturally link to it!! You don’t always have to put efforts to gain links, sometime it works without that as well!

P.S: Although I don’t see any point of penalty here, but just to make sure take a look at your Google Analytics profile and see if the traffic is normal then relax and if it is insanely dropped in the last few days (or may be weeks) then compare the date or drop to the Google update calendar (available here) and if you see the data matches or nearby then you should put the penalty option in consideration.

Hope this helps!