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I decided to try and earn a few bitcoin online several places offer 10 or 8 uBTC for viewing websites ect.
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No! Stay away! You will regret this.
The bitcoin network will refuse to relay transactions that have a payment of less than 0.01 BTC unless you pay a transaction fee of at least 0.0001 BTC (that's 100 µBtc) per kilobyte.
Each of these tiny "dust" coins your are receiving will take up a bit less than 200 bytes in a transaction when you go to send bitcoins somewhere else later.
So lets say you are collecting 10 "free µBtc" for each visit to the website. Lets say you visit the website 20 times. You now have 200 µBtc, but if you try to send it anywhere, you'll end up with a transaction nearly 4 kilobytes in size. You'll have to pay a fee of 400 µBtc just to send your 200 µBtc somewhere! You'll spend all your µBtc on transaction fees and there won't be anything left to actually send!
These "free µBtc" websites prey on those who don't understand how bitcoin works. They "pay" you with amounts they know you'll never be able to spend. They know that having these tiny transactions in your wallet will force you to pay significant fees later when you go to use the coins. They make money off your visit by charging advertisers for placing an add in front of your eyeballs, and then toss you a few shavings of copper off the edge of a penny. They don't care that you will have a bad experience later, they've already milked you for all the profit they can by then.
That depends on how you use those sites. You could still transfer your funds to peerbet or other sites and withdraw once its big enough. Those sites use cold storages and mixed wallets. Another way to use thise in a good way would be transferring it directly to a page where you can use it like btct.co was one. Once you got enough satoshis you buy shares for example or adspace. Just be creative!