Web-based wallets store your private keys online, on a computer controlled by someone else and connected to the Internet. Several such online services are available, and some of them link to mobile and desktop wallets, replicating your addresses between different devices that you own.

One advantage of web-based wallets is that you can access them from anywhere, regardless of which device you are using. However, they also have one major disadvantage: unless implemented correctly, they can put the organisation running the website in charge of your private keys – essentially taking your bitcoins out of your control. That’s a scary thought, especially if you begin to accrue lots of bitcoins.

Coin base, an integrated wallet/bitcoin exchange operates its online wallet worldwide. Users in the US and Europe can buy bitcoin through its exchange services.

Circle offers users worldwide the chance to store, send, receive and buy bitcoins. Currently only US citizens are able to link bank accounts to deposit funds, but credit and debit cards are also an option for users in other countries.

Blockchain also hosts a popular web-based wallet, and Strong coin offers what it calls a hybrid wallet, which lets you encrypt your private address keys before sending them to its servers – encryption is carried out in the browser.

Xapo aims to provide the convenience of an simple bitcoin wallet with the added security of a cold-storage vault.
 
AND I ONLY USE WEB-BASED WALLETS STORE >

In spite of the amazing advances in home office colour printing technology, most national governments take a fairly dim view of you producing your own money. With bitcoin, however, it is encouraged. You can certainly buy bitcoins on the open market, but you can also mine your own if you have enough computing power. After covering your initial investment in equipment and electricity, mining bitcoins is simply a case of leaving the machine switched on, and the software running. And who wouldn't like their computer to earn them money while they sleep? 

It's both.  I find Bitcoin interesting as a new idea which I believe will become more popular over time so it's great that a hobby can make money in itself.  But of course I think that when Bitcoin is more popular and is adopted in stores I'll spend it…