Top best free ppt submission sites

Top 10 free ppt submission sites:

        http://www.authorstream.com
https://issuu.com
http://www.powershow.com/
https://docs.zoho.com
http://www.slideboom.com
        https://www.scribd.com
http://www.2shared.com
        http://www.slideserve.com/
http://www.vcasmo.com/
        http://www.slideshare.com