what are best online sites,which do not waste members time?

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I like Donkeymails & Logiptc, because once U have logged in ,U finish your work & close the site without loging out. Next time you do not have to login,of course on same Computer/Laptop,this saves a lot of time! Time management is must in every field of lime! What are other points & What are other sites which are paying & taking care to utilize our time! Please discuss here Mylot friends. As Sharing with other is Internet! Thanks!