ClosedCoinBulb
CoinBulb is a PTC (Paid To Click) site where you can earn Bitcoin for surfing websites. Get rewarded by logging in every day and earning faster.
No longer operating
It looks like CoinBulb no longer exists.
Summary
CoinBulb is a PTC (Paid To Click) site where you can earn Bitcoin for surfing websites. Get rewarded by logging in every day and earning faster.
Features and earning opportunities
How to earn?

CoinBulb is a Paid To Click site that gives you Bitcoin in return for your efforts. There are 2 main ways to earn: surfing sites and Active surfing sites. The amount you get after a successful visit depends on the time you’ve viewed the site or the amount the advertiser has put up.
What is mBTC?
Everything on CoinBulb is noted in mBTC, which stands for Millibit — 0.001 Bitcoin (BTC).
Daily bonus

There is a daily bonus that gives you a specific amount of satoshis every day if claimed, used as advertising credits. Collecting the whole month of the daily bonus earns 10 days of Premium Membership for free.
Memberships
A membership can be bought to earn faster from your own clicks and from referrals. The free/standard plan gives 100% earnings from own clicks, 8.5% from referral clicks, and 1.5% from referral deposits. The Premium plan gives 200% earnings from your own clicks (2x more), 17.5% from referral clicks, and 12.5% from referral deposits. The Premium membership can only be bought for 90 days at a time, after which it needs to be renewed, and costs 0.005 BTC for the 90-day period.
Referral program
CoinBulb’s referral program lets you earn 8.5% from your referral clicks and 1.5% from their deposits as a standard member. As a premium member, you earn 17.5% of the clicks and 12.5% of the deposits.
Advertise on CoinBulb
You can advertise on the site. Depositing credits to your advertisement balance requires sending at least 0.10000 mBTC. Account balance can be converted to ads balance on the deposit page, but this conversion cannot be undone.
Withdrawals and fees
There are two cash-out options: sending to a Bitcoin Wallet, which requires earning at least 0.2 mBTC, or sending to FaucetHub, which requires only 0.05 mBTC. All payouts are done manually within 72 hours.
Conclusion
It appears that coinbulb has ceased operations.