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Hi Labici, I don't really know your niche and industry so I simply went to Google's Keywords Tool and entered Screenshot and got a few keyword ideas that got pretty high search volume but low competition (long tail keywords). Website Screenshot screen shot software screenshot program Those 3 above are only examples.  You can try it out yourself to find a some low competition but high search volume keyword ideas. Furthermore, if you are a SEOmoz PRO member, you can use their keyword research tool to find keyword alternative or ideas as well.